The iris sphincter muscle is a muscle located in the colored part of the eye called the iris. It is also known as the pupillary sphincter or sphincter pupillae.
The sphincter muscle fibers are near the pupillary margin and slightly anterior to the iris' pigmented epithelium.
It surrounds the pupil of the iris and constricts it in bright light via the pupillary light reflex or during accommodation. The iris regulates the amount of light that reaches the retina at the back of the eye by controlling the diameter of the pupil.
It regulates the flow of aqueous humor into Schlemm's canal and controls accommodation for viewing objects at different distances. It also alters the shape of the lens within the eye, but not the size of the pupil, which is controlled by the sphincter pupillae and dilator pupillae muscles.
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use the enlargements in the figure to rank the following structures and molecules from largest to smallest.
The following organelles and cellular components are found in the cytoplasm: nucleolus ,nucleus ribosome ,vesicle ,rough endoplasmic reticulum.
What are the 12 organelles in a cell?The cytoplasm contains the following organelles and cellular parts:the nucleolus, the nucleus, the ribosome, the vesicle, the rough endoplasmic reticulum, the Golgi apparatus, the cytoskeleton, the mitochondria, the vacuole, the cytosol, the lysosome, and the centriole. One can only see the nucleus with a light microscope, which is the largest cellular organelle.The sole pathways for tiny polar molecules, ions, and macromolecules (such proteins and RNAs) to move between the nucleus and cytoplasm are the nuclear pore complexes. The only positively charged nucleus in an atom is surrounded by a cloud of negatively charged electrons.The electron clouds interact with each other and with the nuclei as atoms come close to one another.To learn more about cellular components refer
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Why are leaves green and not black?.
The leaves are green and not black because leaves аbsorb light in the blue аnd red spectrа, but not green light which аctuаlly more the sun's light.
Plаnts cаn broаdly be divided into four mаin components: roots, stem, flowers аnd leаves. The leаves mаke the plаnt’s energy, or food in, аs every GCSE student knows, the process cаlled photosynthesis.
Plаnts (plus аlgаe аnd certаin bаcteriа) аbsorb light to mаke sugаrs, providing the plаnt with energy аnd some other useful biochemicаl products which the plаnt requires to grow successfully.
Plаnts аnd their leаves look green becаuse the “speciаl pаir” of chlorophyll molecules uses the red end of the visible light spectrum to power reаctions inside eаch cell. The unused green light is reflected from the leаf аnd we see thаt light. The chemicаl reаctions of photosynthesis turn cаrbon dioxide from the аir into sugаrs to feed the plаnt, аnd аs а by-product the plаnt produces oxygen.
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the protein rda for adults is ________ grams per kilogram.
The protein RDA for adults is 0.8 grams per kilogram.
How does the protein RDA for adults compare to the protein needs of athletes?
The protein RDA for adults is 0.8 grams per kilogram, which is a general guideline for the average daily protein intake for healthy individuals. However, the protein needs of athletes may be higher due to their increased muscle mass and activity level. Athletes may require 1.2 to 2.0 grams of protein per kilogram of body weight per day to help support muscle growth and recovery. However, it's important to consult with a sports nutritionist or a healthcare professional to determine specific protein needs for individual athletes.
The protein RDA (Recommended Dietary Allowance) for adults is 0.8 grams per kilogram. This means that for an adult with a body weight of 68 kg, the recommended daily intake of protein is 54.4 grams. However, it's worth noting that this is just a general guideline and individual protein needs may vary depending on factors such as age, sex, muscle mass, activity level, and overall health.
It's important to note that the RDA is the average daily level of intake sufficient to meet the nutrient requirements of nearly all (97-98%) healthy individuals in each life-stage and gender group, however for athletes or people with specific health conditions, the protein needs may differ.
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13. The synthesis of ATP from ADP results in:
a. ADP released
b. ADP storage
C.energy released
D. energy storage
Answer:
C
Explanation:
Energy is released because the bonds are broken.
A bacteria culture begins with 11 bacteria that triple in amount at the end of every hour. How many bacteria are grown during the 7th hour?.
The total amount of bacteria grown during the 7th hour is 8019 when a bacteria culture begins with 11 bacteria that triple in amount at the end of every hour.
Given that a bacteria culture begins with 11 bacteria which triple in the amount at the end of every hour.
To calculate the bacteria's number multiplied by the hours.
The number of bacteria grown at end of one hour is 11.
The number of bacteria grown at end of two hours is = 11 x 3 = 33 as the amount is tripled at every hour.
The number of bacteria grown at end of three hours is = 33 × 3 = 99
The number of bacteria grown at end of four hours is = 99 × 3 =297
The number of bacteria grown at end of the fifth hour is = 297 x 3 = 891
The number of bacteria grown at end of the sixth hour is = 891 x 3 = 2673
The number of bacteria grown at end of the seventh hour is = 2673 x 3 = 8019.
Thus, the total amount of bacteria grown during the 7th hour = 8019.
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Dye injected into a plant cell might be able to enter an adjacent cell through ..
a. Microtubule
b. Microfilament
c. Plasmodesmata
d. Tight Junction
Answer:
The cell wall of the cells has very small pores which are known as the plasmodesmata, they act like a bridge between the two cells. So, if we inject ink into the cell then it will get transferred to the other cell via these pores called plasmodesmata.
What areas were deforested during the early renaissance what was the response?A. apply selective tree harvesting to prevent further damageB. use fires to clear underbrush and dead woodC. move on to another forested areaD. plant new trees
Move on to another forested area was deforested during the early renaissance.
What is deforestation?
Deforestation is the removal of a forest or tree stand from land before it is put to another use other than that of a forest. Conversion of forest land to farmland, ranches, or urban usage is a form of deforestation. Tropical rainforests experience the highest concentration of deforestation. At the moment, woods encompass about 31% of Earth's land area. This is a third less than the amount of forest cover there was before agriculture became more prevalent, with half of that loss occurring in the last century. An area the size of Bangladesh's forest is lost each year between 15 and 18 million hectares. 2,400 trees are typically felled every minute.
Hence the correct answer is D, Move on to another forested area.
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after one division of the nucleus, a new spindle forms around each group of chromosomes.
During mitosis, the nucleus of a cell divides into two identical nuclei, each containing the same number of chromosomes as the original cell.
How do chromosomes get separated during mitosis?During mitosis, chromosomes are separated by the formation of a structure called the spindle, which is composed of microtubules that extend from opposite poles of the cell. The spindle fibers attach to the chromosomes and pull them apart, separating the identical copies of each chromosome into the two new nuclei. The spindle fibers also help to align the chromosomes in the middle of the cell before they are pulled apart. After the chromosomes have been separated, the cell then divides into two daughter cells, each with a complete set of chromosomes.
During mitosis, the nucleus of a cell divide process is controlled by the formation of a structure called the spindle, which is composed of microtubules that extend from opposite poles of the cell.
The spindle fibers attach to the chromosomes and pull them apart, separating the identical copies of each chromosome into the two new nuclei. The spindle fibers also help to align the chromosomes in the middle of the cell before they are pulled apart. After the chromosomes have been separated, the cell then divides into two daughter cells, each with a complete set of chromosomes. The new spindle will form around each group of chromosomes in each daughter cell to ensure that all chromosomes are properly separated and distributed during the cell division.
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A single complete individual capable of response to stimuli, reproduction, growth, and development, and maintenance of homeostasis is termed ____
A single complete individual capable of response to stimulus, reproduction, growth and development, maintain homeostasis is termed a living organism.
What is organism and example?An organism generally refers to a single or individual living species, which exhibits all the properties of life. These can be a plant, animal, bird, insect and even a microbe. There are billions to trillions of different types of organisms living on our planet Earth.
Is life an organism?Living things are highly organized, meaning they contain specialized, coordinated parts. All living organisms are made up of one or more cells, which are considered the fundamental units of life. Even unicellular organisms are complex.
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Baed on the information in the twin tudie, what can we predict about the likelihood of identical twin inheriting Alzheimer' dieae?
Even identical twins with identical inheriting genes have different levels of susceptibility. For identical male couples, the study only showed a concordance rate of 45%.
What are the heritability implications of twin studies?Twin research enables the separation of the genetic and environmental components that contribute to the desired trait. Researchers can calculate how much of the diversity in a trait is due to genetic variation and how much is due to shared or unshared environments.
What are some overarching conclusions drawn from research on identical and fraternal twins?Fraternal twins only share half of their genes with each other while identical twins share 100%. A trait may have genetic roots if identical twins exhibit it more frequently than fraternal twins.
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Which one of the following is NOT a function of glial cells?
a.getting nutrients to the neurons
b.generating action potentials
c.cleaning up the remains of dead neurons
d.providing insulation
generating action potentials is NOT a function of glial cells.
The environment around neurons is preserved and protected by glial cells. Glial cells include those found in the oligodendrocyte, astrocyte, ependymal and microglial tissues of the central nervous system (a). Oligodendrocytes build the myelin coating around axons.
Glial cells primarily support and safeguard neurons (nerve cells), maintain homeostasis, remove waste, and produce myelin.
Recent research has demonstrated that glial cells are more complex than simple "Nervenkitt" cells. The four main subgroups of the overall glial cell population are microglia, astrocytes, oligodendrocytes, and their progenitors, NG2-glia.
Glia plays a key role in synaptic plasticity and synaptogenesis as well as in the growth of the nervous system. Glia plays a part in controlling how quickly injured neurons heal. Glia inhibits repair in the central nervous system (CNS).
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what part of the brain does not fully develop until people are in their mid-20s?
Answer:
the prefrontal cortex
Explanation:
One gene has several different forms, resulting in more than two phenotypes.a. Trueb. False
One gene has several different forms, resulting in more than two phenotypes is True.
A gene can have multiple forms, also known as alleles, which can result in more than two phenotypes.
A phenotype is the observable characteristic or trait of an organism, which is determined by the combination of its genetic makeup (genotype) and the environment.
For example, the gene for eye color in humans can have multiple alleles, such as brown, blue, and green. The presence of different alleles can result in different eye colors, such as brown eyes, blue eyes, and green eyes.
Another example is the gene for height in humans. Height is a polygenic trait, which means it is influenced by multiple genes, each with different alleles. The combination of different alleles of these genes can result in a wide range of heights in humans.
In conclusion, the presence of multiple alleles of a gene can result in more than two phenotypes, and this is known as polygenic inheritance. This is because a trait can be influenced by multiple genes, each with different alleles, which can result in a wide range of variations of that trait.
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fragile x syndrome is a chromosomal disorder in which
Fragile x syndrome is a chromosomal disorder in which FXS is caused by changes in a gene called Fragile X Messenger Ribonucleoprotein 1 (FMR1).
FXS is a hereditary condition known as fragile X syndrome. A gene called Fragile X Messenger Ribonucleoprotein 1 alterations lead to FXS (FMR1). A protein termed FMRP that is required for brain development is typically produced by FMR1. FXS patients cannot produce this protein. Although the FMR1 gene has changed in people with fragile X diseases, they typically still produce part of the protein.
Males and females are both impacted by FXS. However, compared to men, women frequently exhibit milder symptoms. Although the precise number of FXS patients is unknown, a review of research papers estimated that approximately 1 in 7,000 males and 1 in 11,000 females have the condition.
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when atp loses a phosphate, energy is released and phosphates.
ADP and inorganic phosphate are produced when ATP loses one of its phosphates.
What is ATP?
The cellular energy standard is ATP. Its high-energy phosphoanhydride link, which is found between phosphate, serves as a form of energy storage. The high energy link in ATP is dismantled during hydrolysis, releasing a significant amount of the stored energy.
One of the three phosphates in the ATP molecule splits off when a cell has to expend energy to complete a job, resulting in the formation of ADP + phosphate. That phosphate molecule's energy is no longer bound to it and can now be used by the cell to perform tasks.
Adenosine diphosphate (ADP), a version of the nucleotide with only two phosphates, is created when the outermost phosphate of ATP is removed to produce energy.
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Answer:
ADP Phosphates
Explanation:
Edge2023
what is the main component of blood plasma by weight?
Plasma contains 91% to 92% of water and 8% to 9% of solids. It mainly comprises of: Coagulants, mainly fibrinogen, aid in blood clotting. Plasma proteins, such as albumin and globulin, that help maintain the colloidal osmotic pressure at about 25 mmHg.
darwin’s theories were interpreted by social darwinists to indicate that
Social Darwinists subscribe to the idea that some people achieve prominence in society due to their innate excellence. This idea is known as "survival of the fittest."
Many social evils like racism, eugenics, imperialism, and socioeconomic inequality have been defended with the help of social Darwinism. Darwin claimed that all species share a common origin, that species can change through time, and that new species develop from existing ones. According to this theory, each species has a distinct set of heritable (genetic) differences from the common ancestor that have developed gradually over extremely long time periods. A multi-level "tree" connecting all living things is created through repeated branching events, in which new species split off from a common ancestor. Darwin called this process of heritable trait alteration in groups of animals over generations "descent with modification." We now refer to it as evolution.
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the process by which cells grow and divide to produce more cells. this is to help cells grow, repair and replace other cells.
Mitosis is the process by which cells grow and divide to produce more cells. This is to help cells grow, repair and replace other cells.
Mitosis is an essential process for cells to grow and divide, enabling them to produce more cells. This process helps cells grow, repair, and replace other cells, ultimately aiding in the maintenance of healthy cells in the body.
Mitosis is a complex process, beginning with the duplication of the cell’s DNA, followed by the splitting of the cell into two daughter cells. During the process, the daughter cells are identical to the parent cell, carrying the exact same genetic material.
The process of mitosis is essential for the growth and development of living organisms.
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describe the temperature, moisture and air pressure associated with a continental polar air mass.
Surface high pressure, frigid temperatures, and low dew points are characteristics of coastal polar or colonial arctic air masses. Air masses in the maritime polar region (mP) are cold, humid, and unstable.
In biology, what does a temperature mean?The degree to which an individual or environment is hot or chilly . the physical experience of warmth or cold. The amount of heat or cold in a specific location, typically expressed in degrees Fahrenheit (F), Celsius (C), or Kelvin (K).
What role does temperature have in biology?The reaction rates enzyme enzymes, which control processes that appear of any kind levels of a organism's organization, are greatly influenced by temperature.
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What is the process in protein synthesis that uses the information in mRNA to build a protein molecule?.
The act of translating mRNA into tRNA, which participates in transcription, can be thought of as the decoding of instructions for building proteins.
The protein molecules that the genes in DNA encode are the "workhorses" of the cell, performing all the tasks required for life. Proteins include, for instance, DNA polymerases and other enzymes that produce copies of DNA during cell division, as well as enzymes that metabolise nutrients and synthesise new cellular components. The genetic code, which connects the DNA sequence to the amino acid sequence in proteins, is "read" by the mRNA during translation, the second important step in gene expression. In mRNA, a codon is a collection of three nucleotides that designates a certain amino acid.
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Which division of the nervous system includes the brain and spinal cord?a. central nervous systemb. peripheral nervous systemc. somatic nervous systemd. autonomic nervous system
Your brain and spinal cord are two of the components of your central nervous system.
The central nervous system is made up of the brain and spinal cord. The peripheral nervous system, which is made up of nerves that leave the spinal cord and connect every region of the body, is interconnected. The two subsystems that make up the complete nervous system are the central nervous system (CNS) and the peripheral nervous system (PNS). The autonomic nervous system of the peripheral nervous system regulates automatic physiological processes like digestion, blood pressure, respiration, & sexual desire. The nervous system is made up of the brain, spinal cord, and an intricate network of nerves. This system allows for communication with both the brain and the body. The brain controls every physical process.
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Why is heating a first step in pcr amplification of extracted dna?
Heating is the first step of PCR amplification because it is necessary to denature the double-stranded DNA template so that it can be used by the polymerase enzyme.
This process involves breaking the hydrogen bonds that hold the two strands together, which allows the primers to bind to the single-stranded DNA. Heating is also necessary to bthe polymerase enzyme, as it is not active at room temperature.
Additionally, the high temperature denaturation step also helps to increase the efficiency of the polymerase enzyme by increasing its activity and allowing it to bind more tightly to the primer. This makes it more likely that the primer will anneal and that the polymerase will be able to initiate DNA synthesis.
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What alternation of generation in the life cycle of bryophytes is shown in letter A?
Diploid sporophyte generation is the alternation of generation in the life cycle of bryophytes is shown in letter A .
The life cycle of bryophytes has two alternations of generations, one is haploid gametophyte generation, and the other is diploid saprophytic generation. In both the life cycle, the bryophytes possess different morphology and physiological functions. The haploid gametophyte phase lasts longer or dominates the diploid saprophytic phase between these two alternations of generations.
Bryophytes reproduce through both asexual and sexual means. They reproduce asexually via Gemmae formation or fragmentation. Conversely, their sexual reproduction occurs via two different types of spores that form Anthrezoids and Archaegonia.
Bryophytes are terrestrial and non-vascular plants that grow in damp or humid habitats and reproduce via spore generation instead of seed germination. Mosses, hornworts, and liverworts are the three common plants that come under the bryophyte group.
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the theory that all cells come from other cells disproved the idea of?
The theory that all cells come from other cells disproved the idea of Louis Pasteur.
Spontаneous generаtion theory is аn аrchаic scientific theory which stаted thаt living orgаnisms could аrise from nonliving mаtter аnd thаt such а process wаs regulаr in nаture. It аlso explаined the origin of life from the nonliving subjects. Аccording to thаt theory, а piece of breаd аnd cheese wrаpped аnd left in а corner could give rise to mice in а few weeks, or mаggots could rise from deаd flesh.
The hypothesis wаs designed by Аristotle on the bаsis of previous work of nаturаl philosophers аnd the theory held its plаce for two millenniums. Frаncesco Redi аnd Lаzzаro Spаllаnzаni then chаllenged this theory in the 17th аnd 18th centuries, but it wаs still not discredited. It wаs not until the work of Louis Pаsteur аnd John Tyndаll in the 19th century thаt this theory wаs finаlly disproved.
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in the stomach, food becomes a semisolid paste called
Answer: chyme
Explanation:
question number 3, giving 50 points
Light output, More energy is provided when the light output is increased, which speeds up photosynthesis.
Why does photosynthesis go more quickly when the light is stronger?Light output, More energy is provided when the light output is increased, which speeds up photosynthesis. A different factor (such as temperature) is restricting the rate of the reaction, so if the light intensity rises above a certain point, photosynthesis will not proceed as quickly.The rate of photosynthesis will climb as light levels rise from low to high because there is more light available to power the reactions involved in photosynthesis.Light output, More energy is provided when the light output is increased, which speeds up photosynthesis.To learn more about photosynthesis refer to:
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What is the study of cancer known as?.
Answer:
Listen to pronunciation. (on-KAH-loh-jee) A branch of medicine that specializes in the diagnosis and treatment of cancer.
what are the parts of the male structure of a flower?
The parts of the male structure of flower have three parts stamen ,sepals and petals. Flowers are two types male flower and female flower . Two categories of flowers differ by bisexual (male flower + female flower) and asexual (male flower/female flower).
Male flower reproductive part is called stamen. Stamen having two parts anthor lobe (which is in the shape oval at the top) and filament (which supports anthor lobe having shape thin cylinder shape). Anther lobe having two pollen which is filled with pollen grains. Sepals are outer part of the flower which supports the flower and petals are protect reproductive parts of flower which is spectacular color.
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When did cancer study start?.
Answer:
The modern era of cancer research really began in the 19th century and led to the current concept developed by several investigators, notably Rudolf Virchow, that cancer is a disease of cells.
Explanation:
spindle fibers attach to the homologous chromosome pairs
The centromeres are where the spindle fibres connect to homologous chromosomal pairs. The chromosomes can move because the nuclear membrane has broken down.
The chromosomes are subsequently positioned along the cell's equatorial plane by the spindle fibres. Eukaryotic cells have spindle fibres, which are a part of the cytoskeleton as well as cilia and flagella. During mitosis and meiosis, chromosomes are moved by a spindle machinery to guarantee uniform chromosomal distribution amongst daughter cells.
The cell lengthens and elongates due to spindle fibres that are not attached to chromatids. The spindle fibres scatter during telophase as the chromosomes divide and move into separate new nuclei. Two daughter cells are created at the conclusion of mitosis and cytokinesis, each with the appropriate size of the chromosomes.
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