The best example of a conditioned reinforcer is a cold root beer for mowing the lawn on a hot day.
What is conditioned reinforcer?
A conditioned reinforcer is a stimulus that has been associated with a primary reinforcer and is used to increase the probability of a desired behavior. It is used to reinforce a behavior that has been learned through conditioning. Examples of conditioned reinforcers include verbal praise, tokens, and points.
Therefore, The best example of a conditioned reinforcer is a cold root beer for mowing the lawn on a hot day.
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In the early 1900s, scientists noted that chromosome movements during cell division in reproductive cells mirrored the patterns of inheritance described by Mendel. These results and others confirmed that Mendel's hereditary units (genes) were located on chromosomes. The sum total of chromosomes in an organism constitute its __________, whereas the organism's observable traits constitute its __________.
In the early 1900s, scientists noted that chromosome movements during cell division in reproductive cells mirrored the patterns of inheritance described by Mendel. These results and others confirmed that Mendel's hereditary units (genes) were located on chromosomes. The sum total of chromosomes in an organism constitutes its genotype whereas the organism's observable traits constitute its phenotype.
Genotype is defined as the genetic makeup of the organism and the phenotype is the physical characteristic shown by the organism.
genotype is not determined by phenotype, but phenotype is determined by the genotype.
For example, for a normal monohybrid cross between the tall and dwarf pea plant ( TT X tt)
The genotypic ratio is 1:2:1 and the phenotypic ratio is 3:1
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which of the following models, were put forth by lashley and/or hebb? (select all that apply) group of answer choices working memory requires the cortex memory consolidation requires the hippocampus memories are distributed among many cells memory traces involve the same cells that participated in sensation/perception of the stimuli
Lashley and/or Hebb suggested that Memories are distributed among many cells. Thus, option c is correct,
What happens stimulus biology is absent?The term "stimulus" in biology refers to a "differs (physical or chemical) during an organism's environment that results sometimes in functional activity." For instance, sunlight stimulates plants, causing them to grow or migrate toward it.
The stimulus process is what?the nervous system synchronizing the stimuli and reaction. The most fundamental type of response is a direct one-to-one stimulus-reaction reaction. The organism's reaction to the stimulus—a change in the environment—leads to the response.
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Correct question:
Which of the following models, were put forth by Lashley and/or hebb? (select all that apply) group of answer choices
working memory requires the cortex memory consolidation requires the hippocampus memories are distributed among many cells memory traces involve the same cells that participated in sensation/perception of the stimuliBlood types All human blood can be typed as one of O, A, B, or AB, but the distribution of the types varies
a bit with race. Here is the distribution of the blood type of a randomly chosen black American:
(a) What is the probability of type AB blood? Why?
(b) What is the probability that the person chosen does not have type AB blood?
(c) Maria has type B blood. She can safely receive blood transfusions from people with blood types O and B. What is the probability that a randomly chosen black American can donate blood to Maria?
(a) The probability of type AB blood is 0.04
(b) The probability that the person chosen does not have type AB blood is 0.96
(c) The probability that a randomly chosen black American can donate blood to Maria is 0.69
Which blood type is the rarest?The rarest of the eight common blood types, AB negative, is present in only 1% of our donors. We have no trouble locating donors who have AB negative blood, despite the fact that this type of blood is uncommon.
A person's blood type is influenced by the genes of both parents. As a result, the child will probably be of type A if one parent is type O and the other type A. 6 Considering that the O gene is recessive.
A. The probability distribution must meet the following conditions: 1) The probabilities must be 0 ≤ p ≤12) the Sum of all the probabilities
should be 1 Using condition 2,
0.49+0.27 +0.20 + P(B) = 1P(AB) = 1 − 0.96 = 0.04
B. Using the complementary probability formula,
P(A) = 1 − P(A)P(notAB) = 1 − P(AB) = 1 − 0.04 = 0.96
C. P(A or B) = P(A) + P(B)
Using formula.
P(O or B) = P(0) + P(B)P(O or B) = 0.49+ 0.20 = 0.69
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conduct a survey of individuals who smoke and individuals who do not smoke. determine which group has the highest incidence of cancers. observational experiment submit the results and the conclusions to the scientific community. [ choose ] establish identical groups of laboratory rats. expose one group (the model system) to cigarette smoke and compare the incidence of new cancers (if any) with the incidence in the control group. laboratory experiment smoking cigarettes causes cancer. [ choose ] why do people get cancer? question people get cancer.
An observational experiment can be used to conduct the smoking survey.
By smoking, what do you mean?
Smoking is the act of inhaling and exhaling tobacco smoke from cigarettes, pipes, and cigars. It can also refer to other substances that are smoked similarly, like marijuana.The survey's findings revealed that smokers had a higher incidence of cancer than nonsmokers. This implies that smoking may raise the chance of getting cancer.According to the survey's findings, smoking raises one's risk of getting cancer, and those who smoke also have a higher cancer incidence than those who don't.To know more about smoking, here
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illustrated in the top photograph is a circumscribed colony after 3 days of incubation at 30o c. the consistency is cottony to wooly and pigment ranges from gray to deep brown. a light pigmented outer apron is seen at the margins of growth. the reverse is dark brown to black, resulting from a darkly pigmented mycelium. as the colony morphology is not species specific, the identification can be made by the appearance of the macroconidia observed in a stained tease mount made from the surface of the colony as observed in the bottom photomicrograph. from these observations, select from the multiple choices the name of this fungus.
The border to border, light tan delicate cottony grown in 3 days on SABHI agar incubated at 30° C as illustrated in the top photograph is characteristic of one of the Zygomycetes.
What distinguishes Aureobasidium pullulans from other organisms?Pullulans may adopt a wide range of morphologic forms, making it challenging to identify it without culture. Aureobasidium pullulans is the name given to irregular clusters of dark brown mycelia that divide in more than one plane.Colonies are the common name for mycelia that are cultivated in petri dishes in a lab on solid agar substrate. Due to spores or pigmentation, these colonies may display growth patterns that can be utilised to distinguish between different species or groups.Rhodotorula species stand out from other yeasts due to their ability to grow favourably on Sabouraud's Dextrose Agar (SDA) media and produce distinctively coloured colonies as a consequence. Rhodotorula species can be recognised by their negative nitrate assimilation.To learn more about Zygomycetes refer to:
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based on the diagrams above, what is the percent change in the amount of runoff in urban areas compared to forested areas? responses
The quantity of drainage in urban areas differs by 450% from that in forested areas. The diagram shows that only 10% of the water in forests is runoff, with the remainder being absorbed by the soil and lost to evaporation.
It demonstrates that only 10% of the water output in a forested area is due to runoff. The runoff is 5.5 times larger when you get to a fully developed metropolitan region with 75–100% surface imperviousness due to decreased evapotranspiration and infiltration. To promote ground infiltration, replace conventional pavement with more porous pavement. Due to the clearing of trees to make room for cultivation, the percentage of land in Europe that is covered by forest has decreased from 80% to 30% in recent years.
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Please help me get this correct. In a group of cows, some individuals have horns and others do not. In this group, the gene for the horns trait has two alleles. The allele H is for not having horns, and the allele h is for having horns.
Petunia, a cow from this group, does not have horns. Petunia has two alleles for not having horns.
Based on this information, what is Petunia's genotype for the horns gene?
Which of the following provides the best indication that light is required for the activation of electron transfer reactions in chloroplasts?answer choicesCalculating the rate of change of the absorbance for sample 1Comparing the observed results for sample 2 and sample 3Repeating the entire experimental procedure at nightIncluding multiple trials for all the samples
B)Comparing the observed results for sample 2 and sample 3. The thylakoid membrane of chloroplasts undergoes light-dependent processes that take place when sunshine is present.
During these chemical processes, the sunshine is transformed into energy. The photosynthesis process is carried out by the plant's photosystem, which receives energy from the sun's rays thanks to the chlorophyll. The electron transport chain, two photosytems (II and I), and other components involved in the light-dependent processes are all encased within the thylakoid membrane. An excited electron of the chlorophyll a special pair is transferred from PSI to PSI via PSII's light-harvesting PSII through the Pq, Cyt, and Pc electron transport chains. An electron is moved from its ground state to an excited state during photosynthesis as a result of visible light activating chlorophyll.
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humans are different from other animals in several different ways. for example, unlike other animals, humans .
Example, unlike other animals, humans are able to form groups with multiple roles.
What is meant by humans ?
The most prevalent and ubiquitous species of primates is the human species (Homo sapiens).They are a particular species of great ape known for their bipedalism and outstanding cognitive abilities as a result of their massive and complex brains.Humans are highly social creatures who want to live in elaborate social systems made up of a variety of coexisting and conflicting groupings, ranging from families and kinship networks to political states. Thus, a wide range of values, social standards, languages, and rituals have been developed as a result of social interactions between humans, each of which supports human society. Humanity has developed science, technology, philosophy, mythology, religion, and other fields of study out of a desire to comprehend and control phenomena.To learn more about humans refer to
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the illustration above is a model of a typical beet root cell. based on the experimental results, which of the following best represents the effect of acetone on the permeability of cellular membranes? Both cells have vacuoles. Second cell has dotted membrane with betacyanin outside (dots outside)
There are vacuoles in both cells. The effect of acetone on the permeability of cellular membranes is best represented by the second cell's dotted membrane with betacyanin outside (dots outside).
What do cell membranes do?A cell membrane, often referred to as a plasma membrane, is present in every cell and separates the interior of the cell from the outside environment. Semipermeable lipid bilayers compose the cell membrane. Materials are transported into and out of cells under the supervision of the cell membrane.
Glycerophospholipids, which are constituted of glycerol, a phosphate group, and two fatty acid chains, are the molecules that make up cellular membranes, including plasma and interior membranes. The three-carbon molecule glycerol serves as the structural foundation of these membrane lipids.
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The sensory characteristic of a product that sticks with consumers, helping them to remember the product in a unique way, is called the ________.A) phoneme B) schema C) sensory input D) interpretant
The sensory characteristic of a product that sticks with consumers, helping them to remember the product in a unique way, is called the sensory input
What is sensory input ?The sensory organs' immediate and direct reaction to stimuli is known as a sensation. Any type of input unit to one of these senses can be a stimulus. Products, packages, brand names, commercials, and adverts are some examples of stimulus.
A stimulus is exposed when it comes into contact with a person's sensory receptors. The degree to which a specific input is given priority during processing is referred to as attention. The meaning we give to sensory stimuli is referred to as interpretation.
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In which situation would a snake be expected to have the largest size? (1 point)
O restricted space, inadequate food
O lots of space, large supply of food
O lots of space, inadequate food
O restricted space, large supply of food
Answer:
b
Explanation:
bacause the snake isnt liited to the space of its survival and it has alot of food so it wont be limited to growth or any defects
How is this form of programmed cell death a process that emerges from the orderly integration of signaling pathways? Rank the steps from first to last. Reset Help Signal transduction pathways are initiated Cell components are broken down. A death signal is passed through relay molecules. Caspases and other enzymes are activated. A shape change of the protein activates cytoplasmic molecules.A death signal binds to a transmembrane receptor protein. First step Last step
Programmed cell death a process that emerges from the orderly integration of signaling pathways.
Programmed cell death, also known as apoptosis, is a process by which cells die in a controlled and orderly manner. This process emerges from the integration of signaling pathways, and the steps involved can be ranked as follows: A death signal binds to a transmembrane receptor protein. This is the first step in the process, as the cell receives the signal to initiate apoptosis. Signal transduction pathways are initiated. Once the death signal binds to the receptor, it triggers a cascade of signaling pathways that lead to the activation of downstream molecules .A shape change of the protein activates cytoplasmic molecules. As the signaling pathways are activated, the shape of certain proteins in the cell changes, which in turn activates molecules in the cytoplasm. Activated cytoplasmic molecules trigger the activation of caspases and other enzymes, which play a crucial role in the process of apoptosis.
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which of the following causes subsistence farmers to increase labor-intensive practices like weeding, applying manure, and crop rotation?
Subsistence farmers increase labor-intensive measures including crop rotation, manure application, and weeding as a result of the demand to feed a growing population.
The cultural practice of growing various crop species over several years is known as crop rotation. Weeds, illnesses, insects, and nematodes have all been known to be suppressed by this method. According to a long-term study, weed management tactics accounted for the majority of changes in weed density, whereas crop rotation alone only partially explained the variation in weed density (i.e. tillage or herbicides). Crop rotation significantly affects weed species variety despite having a small overall impact on weed density. Different crops provide different levels of weed competition. For instance, maize is more competitive with weeds than soybeans because it is typically planted sooner, grows taller, and is harvested earlier.
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The complete question is:
Which of the following causes subsistence farmers to increase labor-intensive practices like weeding, applying manure, and crop rotation?
A. the desire of people to make any process better
B. decreasing costs of materials and equipment
C. the decreasing fertility of agricultural land
D. the pressure to feed a growing population
true/false. body mass index (bmi) has traditionally been used to determine desirable body weight. however, over recent years, height and weight tables have been primarily used to identify whether a person is underweight, normal, overweight, or obese.
Answer:
f
Explanation:
True. While BMI has traditionally been used to determine desirable body weight, it is not always the most accurate measure of body fatness or health.
In recent years, height and weight tables have become more commonly used to identify whether a person is underweight, normal weight, overweight, or obese through BMI.
These tables take into account a person's height, weight, and body frame size to determine a healthy weight range. However, it is important to note that these tables may also have limitations and should be used as a general guide rather than a definitive measure of health.
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to obtain a sputum specimen, which of the following steps are part of the procedure that the phlebotomist must complete when a requisition is received for this non-blood collection?
Instruct the patient to cough deeply and expectorate into the container to obtain a sputum specimen is the step that are part of the procedure that the phlebotomist must complete when a requisition is received for this non-blood collection.
Sputum is a sample of mucus secreted by the lungs and bronchi. The sample may undergo a cytologic examination (microscopic inspection) to check for the presence of cancerous cells or a pathogenic bacteria test (bacteriologic examination). The sample that is taken must be mucus from the lungs and bronchi, not saliva. the collecting time. Gargle or rinse with water. How to Take a Sputum Sample Only take one sample a day. Pick up the sample(s) as soon as you awaken from sleep. To remove the mucus from your lungs, cough as forcefully as you can (instead of saliva from your mouth).
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a polymorphic virus changes its internal code to one of a set number of predefined mutations whenever it is executed. True or False
True: A polymorphic virus changes its internal code to one of a set number of predefined mutations whenever it is executed.
Poly means numerous, and morphic means having different shapes. In order to escape being discovered by antivirus software, polymorphic viruses, as their name suggests, are complex computer viruses that change their appearance as they spread. A mutation engine and a self-replicating computer code combine to form a self-encrypting virus. Thus, the given statement is true.
Antivirus software adds viruses it discovers to a blacklist and promptly disables any new viruses that exhibit the same characteristics. With the polymorphic virus, the infection's core functionality is retained even while the signature or decryption method changes with each mutation. Antivirus software that depends on traditional signature-based detection is unable to recognise and block malicious code if the signature and decryption techniques change.
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which of the following is not one of the four processes of evolution that leads to changes in the frequency of alleles in a population over time?
Mutation, gene flow, genetic drift, and natural selection are the four mechanisms that drive evolution and modify the frequency of alleles in a population through time.
Individuals moving into or out of a population cause gene flow. A small population's genetic drift is a random shift in allele frequency. Allele frequencies in the children and parents may, by chance, change when a small number of parents give birth to just a few kids. New genetic variety is produced by mutation in a gene pool. All new alleles develop in this manner. The mutations that affect evolution in sexually reproducing organisms are those that take place in gametes. Thus, allele frequencies are not significantly influenced by mutations alone. Genetic drift and gene flow alter the allele frequencies in a gene pool. Allele frequencies may be significantly impacted by a high migration rate.
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Which of the following is a protein that can hold several other relay proteins as it binds to an activated membrane receptor?
answer choices
transcription factor
kinase
phosphatase
scaffold
scaffold is a protein that can hold several other relay proteins as it binds to an activated membrane receptor.
A scaffold protein is a type of protein that can act as a "molecular hub" by binding to multiple other proteins. Once the scaffold protein binds to an activated membrane receptor, it can hold several other relay proteins such as kinases, phosphatases, and transcription factors, allowing for the coordination of various signaling pathways. Scaffold proteins play a crucial role in relaying and integrating signals from the cell surface to the intracellular environment.
Scaffold proteins can bring together different signaling molecules and direct them to specific locations within the cell, allowing for the efficient and coordinated response to a signal. They can also modulate the activity of these signaling molecules by regulating their interactions with other proteins.
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match each definition with the correct term. group of answer choices borborygmus [ choose ] peptic ulcers [ choose ] polyp [ choose ] hepatitis [ choose ] salmonellosis
Borborygmus - grumbling sound that intestinal gas makes. That's because a rumbling sound is created when the muscles in your digestive system transport food, liquid, and gas through your stomach and small intestine.
Peptic ulcers - ulcers that affect the digestive system's mucous membranes. When stomach acid affects the lining of the digestive tract, ulcers develop. H. Pylori bacteria is one of the most typical causes.
Polyps - mushroom-like growth on the mucous membrane's surface. In the course of a colonoscopy study into intestinal abnormalities or symptoms, polyps are frequently found.
Hepatitis - liver inflammation Hepatitis can be brought on by excessive alcohol consumption, pollutants, some drugs, and specific medical problems. Hepatitis is brought on by a virus.
Salmonellosis - intestinal infection brought on by feces-contaminated food. Humans typically contract salmonella by consuming foodstuffs contaminated with animal excrement.
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Select the features that are present in multicellular organisms but not in unicellular organisms.
A.Specialized cells
B.Organ systems
C.Cell division
D Cell organelles
Answer:
Specialized cells, organ systems, and cell organelles are all present in multicellular but not unicellular organisms
Explanation:
A. Specialized cells and B. Organ systems are features that are present in multicellular organisms but not in unicellular organisms.
Specialized cells are cells that have developed unique structures and functions to perform specific tasks within the organism. In multicellular organisms, different types of specialized cells come together to form tissues, which in turn form organs and organ systems.
Organ systems are groups of organs that work together to perform specific functions within the organism. For example, the digestive system, respiratory system, and circulatory system are all examples of organ systems that are present in multicellular organisms but not in unicellular organisms.
Cell division (C) and cell organelles (D) are features that are present in both unicellular and multicellular organisms. Cell division is necessary for both types of organisms to reproduce, while cell organelles are structures that are present within cells to perform specific functions.
Calculate the percentage of the total cell number represented by each tissue or organ listed by using this formula: Number of cells in adult Total number of cells × 100.
Brain: 86 billion cells / 37 trillion cells x 100 = 0.2%
Heart: 37 billion cells / 37 trillion cells x 100 = 0.1%
Liver: 80 billion cells / 37 trillion cells x 100 = 0.2%
Skin: 19 billion cells / 37 trillion cells x 100 = 0.05%
Skeletal muscle: 38 billion cells / 37 trillion cells x 100 = 0.1%
What is Skeletal muscle?
Skeletal muscle is a type of voluntary muscle tissue found in animals. It is composed of elongated, multinucleated cells called muscle fibers and is attached to bones by tendons.
Skeletal muscle is responsible for the movement of bones and other structures, such as the heart and blood vessels. It is the most abundant tissue in humans and other vertebrates.
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which of the following is a primary function of brain development in the first year of life? group of answer choices development of neurons and glial cells ossification formation of synapses proximodistal development
The formation of synapses is a primary function of brain development in the first year of life.
Synapse formation is depicted as a multicomponent process in which an initial synaptic contact nucleates the organization of pre- and postsynaptic specializations, which are then specified, i.e. endowed with specific properties.
Synaptogenesis, or the formation of synaptic connections, occurs when a growth cone reaches its target and transforms into a presynaptic terminal, a process that requires actin cytoskeleton reorganization.
Synapses are typically formed between nerve terminals—axon terminals—on the sending neuron and the cell body or dendrites of the receiving neuron, as you may recall from the article on neuron structure and function.
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can someone please help me!!!!!!
Answer:
3. Don Walsh
4. 50%
Answer:
3- Don Walsh
4- 50%
hope this helps
this photograph shows a positive reaction in each of the tubes with the tube on the left containing esculin medium and the tube on the right containing heart infusion broth with 6.5% sodium chloride. the bacterial species that characteristically produces these reactions is:
The bacterial species that characteristically produces these reactions is the reaction results in Enterococcus faecalis.
The bacteria known as enterococci are found in the gastrointestinal tract. The species of these bacteria range from 18 to more. A common species is Enterococcus faecalis (E. faecalis). In the mouth and vagina, these bacteria are also present. They can survive in hot, salty, or acidic settings because they have a high level of resilience.
In your intestines, E. faecalis typically exists in a healthy state. But it could result in a more serious infection if it spreads to other bodily areas. When you undergo surgery, the germs may enter your blood, urine, or a surgical wound. More serious infections, such as sepsis, endocarditis, and meningitis, can develop from there if it spreads to other locations.
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Sort each description by the type of RNA it describes. Drag each item to the appropriate bin. View Avallable Hint(o) is often drawn as a cloverleaf shape is produced in the nucleus is found in ribosomes contains genes for a protein contains an anticodon tRNA mRNA rRNA
tRNA (transfer RNA) is often drawn as a cloverleaf shape and is found in ribosomes. It contains an anticodon, which allows it to match a specific amino acid to a codon on mRNA (messenger RNA).
During protein synthesis. mRNA is produced in the nucleus and contains the genes for a protein, which are transcribed from DNA. rRNA (ribosomal RNA) is also found in ribosomes and helps form the structure of the ribosome, where protein synthesis occurs. In summary, tRNA is responsible for matching amino acids to codons during protein synthesis, mRNA carries the genetic information from the nucleus to the ribosome, and rRNA helps form the structure of the ribosome, where protein synthesis takes place.
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the supergroup of domain eukarya that has some (not all) organisms that display threadlike pseudopodia.
supergroup of domain eukarya that has some (not all) organisms that display threadlike pseudopodia are SAR clade
what is SAR clade?
The SAR supergroup, also just SAR or Harosa, is a clade of eukaryotic organisms that includes stramenopiles (heterokonts), alveolates, and Rhizaria. The name is acronym derived from first letters of each of these clades; it has been alternatively spelled "RAS".
Structure Activity Relationships (SAR) can be used to predict the biological activity from molecular structure. This powerful technology is used in drug discovery to guide acquisition or synthesis of desirable new compounds, as well as to further characterize existing molecules.
Eukaryotes can be further classified into the several clades including two major clades which are both unikonts. These two major clades are Opistokonts and Amoebozoans.
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the smell of an explosive, which triggers the bee to extend its proboscis after learning the association
The process by which bees learn to associate the smell of an explosive with the reward of food is called classical conditioning.
In classical conditioning, a neutral stimulus (in this case, the smell of the explosive) is repeatedly paired with a naturally occurring stimulus (the reward of food) until the neutral stimulus comes to elicit a response (the bee extending its proboscis) similar to the one elicited by the naturally occurring stimulus. This type of learning was first described by the Russian psychologist Ivan Pavlov in the late 19th century.Bees are capable of learning through classical conditioning, which is a type of learning in which an organism learns to associate a previously neutral stimulus with a naturally occurring stimulus in order to elicit a specific response. This process occurs in bees when they are trained to associate the smell of a specific odor, such as a flower, with the reward of food, such as nectar.
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"What dimorphic genus characteristically produces barrel-shaped arthroconidia separated by dysjunctor cells?A) Geotrichum speciesB) Trichosporon speciesC) Microsporum speciesD) Coccidiodes immitus"
Trichosporon is a genus of dimorphic fungi that characteristically produces barrel-shaped arthroconidia that are separated by dysjunctor cells. This morphological feature is unique to Trichosporon and is used to distinguish it.
Support your answer.Trichosporon is a genus of dimorphic fungus, which means it has two different forms, one of which resembles yeast and the other of which resembles mycelium. Trichosporon generally generates barrel-shaped arthroconidia, which are particular to the genus and are divided by dysjunctor cells, in its mycelial form. Small cells called dysjunctor cells aid in the development of new colonies by separating the arthroconidia.
These Trichosporon morphological traits are used to identify and separate the various Trichosporon species from other fungus. Trichosporon are typically found on the skin of plants and animals as well as in soil and water. Trichosporon species are known to infect people, especially those with impaired immune systems.
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Donor red blood cells (RBCs) were collected on July 12th of this year. The RBCs were then frozen in glycerol on July 17th (5 days later) and stored at -65o C.
The frozen Red Blood Cell unit's expiration date should reflect July 12, which is 10 years after the date of collection.
Since the invasion necessitates at least one of these antigens, it has been found that Fy(a-b-) persons are resistance to Plasmodium knowlesi / P. vivax infection. Alloantibodies to the Rh & Kidd antigens as well as antibody to carbohydrate antigens are more reactive after enzyme treatment (ABO, H, I, P, and Lewis). Most frequently, reactivity to the MNS & Duffy antigens is eliminated by enzyme therapy. RhD status is routinely determined for all patient samples prior to blood grouping since, after ABO antigens, the D antigen is therapeutically the most significant. RhD positive refers to those who express the D antigen, which makes up about 85% of the population; RhD negative refers to people who do not.
(Donor red cells were collected on July 12th of this year. The RBCs were then frozen in glycerol on July 17th (5 days later) and stored at -65°C. What should the expiration date read on the frozen RBC unit?
A. July 12, 1 year from collection date
B. July 17, 1 year from freezing date
C. July 12, 10 years from collection date
D. July 17, 10 years from freezing date)
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