Myelination, which improves the speed and effectiveness of information moving through the nervous system, is the process through which nerve cells are covered with specialised cells.
Schwann cells and oligodendrocytes of the peripheral nervous system (PNS) and central nervous system (CNS), respectively, produce myelin. The system of nerves outside of your central nervous system is called your peripheral nervous system. Oligodendrocytes. The axon in the the central nerve system are insulated by these cells. They accomplish this by creating a myelin coating that envelops a section of the axon. Up to 50 axonal segments can be myelinated by a single oligodendrocyte. Glia of the nervous system known as Schwann cells contribute to build the
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If a plant is homosporous, then it does not produce sperm and eggs.
True
False
False. Homosporous plants are those that produce a single type of spore, which gives rise to a gametophyte that produces both male and female gametes (sperm and eggs) through the process of mitosis.
This is in contrast to heterosporous plants, which produce two distinct types of spores, each of which gives rise to a gametophyte that produces either male or female gametes. In homosporous plants, the gametes produced by the gametophyte can fertilize each other to form a zygote, which then develops into a sporophyte. Therefore, homosporous plants are still capable of sexual reproduction, even though they do not produce separate male and female structures like heterosporous plants.
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Most water molecules that cross the plasma membrane do so byA) diffusion through aquaporins.B) diffusion through the plasma membrane.C) diffusion through ion channels.D) active transport by ion channels.E) active transport by aquaporins
Most water molecules that cross the plasma membrane do so by diffusion through aquaporins.
Aquaporins (AQP) are essential membrane proteins that act as conduits for the passage of water and, occasionally, tiny solutes. Animals, plants, and microorganisms all have them preserved in aquaporin. Each aquaporin molecule has a pore in its centre, according to structural investigations of the molecules.
Diffusion is the movement of molecules along a concentration gradient from a region of greater concentration to a region of lower concentration.
The definition of diffusion is the transfer of individual molecules of a material from a region of higher concentration to a region of lower concentration over a semipermeable barrier in diffusion.
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select the correct statement about the function of myocardial cells.
The statement that is correct about the function of the myocardial cells is that the all-or-none law as applied to cardiac muscle means that the entire heart contracts as a unit or it does not contract at all. That is option B.
What are myocardial cells?The myocardial cells are the type of cells that are located in the myocardial region of the heart which are the individual cells that makes up the cardiac muscles (myocardium).
The all-or-none law is a principle that governs the response of a muscle fiber whereby any stimulus must have same response or none at all.
The entire heart contracts as a unit or it does not contract at all when the muscles cells are stimulated.
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Complete question:
Select the correct statement about the function of myocardial cells.
A) The refractory period in skeletal muscle is much longer than that in cardiac muscle.
B) The all-or-none law as applied to cardiac muscle means that the entire heart contracts as a unit or it does not contract at all.
C) Cardiac muscle cells each are innervated by a sympathetic nerve ending so that the nervous system can increase heart rate.
D) The influx of potassium ions from extracellular sources is the initiating event in cardiac muscle contraction.
when did our human ancestors become mostly hairless
Around 1.6 million years ago, during the evolution of the Homo genus, our ancestors largely lost their hair.
What is evolution?The process of evolution is how populations of living things change over time, typically over many generations. Natural genetic differences that arise in a population as well as procedures like natural selection, genetic drift, and gene flow all contribute to evolution.
About 1.6 million years ago, with the evolution of the genus Homo, our predecessors were mostly hairless and lost the majority of their body hair. The need to control body temperature as people began to spend more time in open savannas and hot temperatures was one of the causes of this loss of body hair. Less hair allowed for better heat transfer and kept the body cool. Having less hair would make it harder for parasites to attach to and survive on the body, hence it is thought that hair loss was an adaptation to lower the chance of parasitic infections.
In order to protect themselves from the elements, including clothes and shelter, people have devised a variety of strategies over time as they have continued to evolve and adapt to varied surroundings.
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Heterotrophs are organisms that consume other organisms in order to gain nutrients. Compare two different categories of heterotrophs in terms of how they obtain nutrients. Explain your answer in one to two sentences.
The comparison between 2 different categories of heterotrophs in terms of how they obtain nutrients are explained below.
What are heterotrophs?Heterotrophs are the organisms that cannot prepare that own food and depend on other organisms for their food and nutrient requirement.
The two different categories of heterotrophs are: herbivores and carnivores.
Herbivores obtain nutrients by consuming plant material, while carnivores obtain nutrients by consuming other animals. Herbivores often have longer digestive tracts and specialized teeth for grinding plant material, while carnivores typically have shorter digestive tracts and sharp teeth for tearing flesh.This interdependence maintains the stability and balance in the ecosystem. Therefore, they play the most important role in nutrient cycling.
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What are the 3 main components of a nucleotide?
A nucleotide is a molecule that serves as the basic building block of nucleic acids such as DNA and RNA. It consists of three main components: a nitrogenous base, a pentose sugar, and a phosphate group.
The nitrogenous base is a heterocyclic aromatic molecule that contains one or more nitrogen atoms. There are two types of nitrogenous bases: purines (adenine and guanine) and pyrimidines (cytosine, thymine in DNA, or uracil in RNA). The specific arrangement of the nitrogenous bases along the DNA strand forms the genetic code that determines the characteristics and traits of an organism.
Pentose sugar is a five-carbon sugar that is either ribose (in RNA) or deoxyribose (in DNA). The pentose sugar provides the backbone for the nucleic acid chain.
A phosphate group is a functional group made up of phosphorus and oxygen atoms. It is attached to the 5' carbon of the pentose sugar and provides a negative charge to the molecule.
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what is the role of detergent, ethanol, and salt in the extraction process?
The components of the DNA extraction buffer serve the following purposes:
(1) the soap aids in dissolving the phospholipid bilayers that surround the organelles and cell membrane;
2) the salt is used to disrupt protein chains that bind to the nucleic acids;
(3) the ethanol is used to precipitate the DNA.
Cell membranes and other barriers that might prevent the desired molecules from being extracted can be dismantled by detergent. By forming micelles, it can also aid in the solubilization of hydrophobic molecules.
Polar and non-polar compounds can be extracted using ethanol as a solvent. By destroying the hydrogen bonds and hydrophobic interactions between molecules, it can also be used to precipitate specific molecules, such as nucleic acids.
In addition to increasing some molecules' solubility, salt can be used to break up hydrogen bonds and hydrophobic interactions between molecules.
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how identify the negative consequences of establishing a price floor on milk.?
Identify the negative consequences of laying out a cost floor on milk. There will be a diminishing in the part of the milk bid. Sellers will be drawn to partake in illicit conduct to recover a part of their fees because of milk that went unsold.
Some of time, an administration needs to assist makers by setting a base cost underneath which peopling are not permitted to trade. This resembles the cost cap backward. For instance, in Pennsylvania, there are the least costs on milk, which is intended to assist with draining makers getting a "fair" cost for their item.
Makers are in an ideal situation because of the limiting cost floor if the more exorbitant cost (higher than harmony cost) compensates for the lower amount sold. Purchasers are in every case more regrettably off because of a limiting cost floor since they should pay something else for a lower amount.
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What is a multiple base design?
A multiple-base design is a research design used in experimental or quasi-experimental studies where the same intervention or treatment is applied to multiple groups, each of which serves as a control group for the others.
In a multiple-base design, the treatment or intervention is applied at different times or under different conditions to different groups, with each group serving as a control for the others. For example, a study might involve three groups, with one group receiving the treatment at the beginning of the study, another group receiving the treatment in the middle of the study, and a third group receiving the treatment at the end of the study. Each group would serve as a control for the others, allowing researchers to determine the effects of the treatment over time and under different conditions.
Multiple base designs are useful in situations where it is not possible or ethical to randomly assign participants to treatment and control groups, such as in studies of medical or educational interventions.
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What is the term of the DNA-containing structure only seen during mitosis and first seen in prophase?
The term of the DNA-containing structure only seen during mitosis and first seen in prophase is a chromosome.
There аre two wаys cell division cаn hаppen in humаns аnd most other аnimаls, cаlled mitosis аnd meiosis. When а cell divides by wаy of mitosis, it produces two clones of itself, eаch with the sаme number of chromosomes. When а cell divides by wаy of meiosis, it produces four cells, cаlled gаmetes.
Prophаse is the first phаse of mitosis. During this phаse, the chromosomes inside the cell's nucleus condense аnd form tight structures. In fаct, the chromosomes become so dense thаt they аppeаr аs curvy, dаrk lines when viewed under а microscope.
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what property of a telescope influences its resolving power?
The resolving power of a telescope is influenced by its aperture or the diameter of its primary mirror or lens. The larger the aperture of a telescope, the greater its ability to collect light and the finer the details it can resolve in an observed object.
Resolving power is a measure of a telescope's ability to distinguish fine details in an object that are close together. This is limited by a phenomenon known as diffraction, which causes light waves passing through the telescope's aperture to interfere with each other and create a blurred image.
The amount of diffraction that occurs is proportional to the wavelength of the light being observed and inversely proportional to the aperture size. Therefore, a larger aperture can minimize the effects of diffraction and improve a telescope's resolving power.
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what are pitbulls hypoallergenic?
Pitbulls are not considered hypoallergenic dogs. Hypoallergenic dogs are those that are less likely to cause allergic reactions in people who are sensitive to pet dander and other allergens.
This is because hypoallergenic dogs produce fewer allergens in their saliva, urine, and skin cells, which can trigger allergic reactions. Pitbulls, like many other dog breeds, shed their fur, which can contain dander and other allergens. In addition, pit bulls may produce more saliva than some other breeds, which can also contain allergens.
While there is no such thing as a completely hypoallergenic dog, some breeds are considered to be more hypoallergenic than others, such as the Poodle, Bichon Frise, and Portuguese Water Dog.
If you have allergies and are considering getting a dog, it is important to spend time with different breeds to determine if you have an allergic reaction before making a decision. Regular grooming, bathing, and vacuuming can also help reduce allergens in the home.
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In which of the following examples does a vitamin or mineral function as a cofactor? a. DNA polymerase requires zinc to replicate DNA. b. Ribosomes require tryptophan to construct proteins. c. Hydroxylase enzymes require vitamin C during collagen synthesis. d. Calcitriol, a form of vitamin D, regulates calcium levels in blood.
The following example does vitamin or mineral function as cofactor : a.) DNA polymerase requires zinc to replicate DNA and c.) Hydroxylase enzymes require vitamin C during collagen synthesis.
When does a vitamin or mineral function as cofactor?Numerous vitamins serve as cofactors to enable the enzymes to catalyze processes, including production of essential proteins. For example, vitamin C functions as a cofactor in the synthesis of collagen which is a protein found in connective tissue. Vitamin deficiency is a good example of cofactor deficiency.
Cofactors can be organic or inorganic molecules that are required by enzymes to function. Many organic cofactors are vitamins or molecules that are derived from vitamins and most inorganic cofactors are minerals.
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What flows into the cell during action potential?
Ions flows into the cell during action potential
During an action potential, ions flow into the cell, which causes the membrane potential to change.
Specifically, positively charged ions, such as sodium (Na+) ions, flow into the cell, while negatively charged ions, such as potassium (K+) ions, flow out of the cell.
This rapid and brief influx of positive charge causes the membrane potential to become more positive, which is called depolarization.
This depolarization triggers the opening of voltage-gated ion channels, allowing more ions to flow into the cell, and leading to further depolarization.
If the depolarization reaches a certain threshold, it triggers an all-or-nothing response, called an action potential, which spreads rapidly along the cell membrane.
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Please can someone help?
The person is a male and the person has trisomy 21 are the two observation that scientist could make from this human Karyotype.
What is a simple definition of a sex chromosome?
A specific form of chromosome involved in determining sex is called a sex chromosome. The two sex chromosomes, X and Y, found in humans and the majority of other mammals, together define an individual's sex. Male cells include one X and one Y chromosome, while female cells contain two X chromosomes.
The Y chromosome belongs to group G, while the X chromosome belongs to group C. Each chromosome (or pair of chromosomes) has bands and sub-bands designated to its right, and the gene for the sex-determining region Y protein is found at Yp11.
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Describe the structure and function of DNA. Where is DNA found?
What is the process of recording a radiographic study of the blood vessels?
The process of recording a radiographic study of the blood vessels is called angiography or arteriography.
Angiography is a diagnostic procedure that uses X-rays to visualize the blood vessels and identify any abnormalities or blockages. The procedure is typically performed by a radiologist, who is a medical doctor trained in the use of medical imaging techniques.
During the procedure, the patient is positioned on an X-ray table, and a contrast agent is injected into the blood vessels through a small catheter. The contrast agent makes the blood vessels visible on the X-ray image, allowing the radiologist to evaluate the structure and function of the blood vessels.
In some cases, the catheter may be inserted through a small incision in the groin or arm, and guided to the area of interest using X-ray or ultrasound guidance. This is known as an invasive angiography or arteriography.
Alternatively, non-invasive techniques such as computed tomography (CT) or magnetic resonance imaging (MRI) can also be used to visualize the blood vessels. These techniques do not require the use of contrast agents or invasive procedures, and can provide detailed images of the blood vessels and surrounding tissues.
Overall, angiography is an important diagnostic tool for evaluating the blood vessels and identifying any abnormalities that may be contributing to a patient's symptoms.
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Select the true statements about SDS PAGE, a method of separating proteins. Assume that SDS PAGE is performed under reducing conditions.
A) Proteins are visualized using a dye that binds to the gel matrix, but not to proteins. B) Sodium dodecyl sulfate binds proteins, resulting in protein SDS complexes that are similar in size. C) Protein SDS complexes migrate toward the positive electrode. D) SDS PAGE utilizes agarose gel to separate proteins. E) Smaller proteins migrate faster through the polyacrylamide gel. F) A protein binds roughly 1.4 times its mass of SDS, resulting in a large overall negative charge.
The accurate comments on the protein separation technique SDS PAGE. The right statements, assuming SDS PAGE is run, are choices C, E, and F.
What does molecular biology SDS-PAGE mean?Sodium Dodecyl Sulfate-Polyacrylamide Agarose Gel is known as SDS-PAGE. It is a procedure carried out in a lab to separate proteins based on their molecular weight. The foundation of SDS-PAGE is the idea that charged molecules flow in the direction of the membrane with the opposing charge.
What part does SDS play in the page?A detergent that is contained in the SDS-PAGE stock solution is known as SDS. SDS and some reducing chemicals work together to damage the secondary structure of proteins by rupturing their disulfide links.
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An isotonic solution means that the solute concentration outside the cell:A. Is slightly less than inside the cell B. Is much greater than inside the cell C. Is much less than inside the cell D. Is same as inside the cellE. Is slightly greater than inside the cell
An isotonic solution means that the solute concentration outside the cell, is same as inside the cell.
What is an isotonic solution?When a selectively permeable membrane, such as the cell membrane, is present, a solution is said to be isotonic if it contains the same amount of solutes as the solution on the opposite side of the membrane. Because of the identical concentration gradient on both sides, there is no net flow of water over the membrane. A cell enters a condition of equilibrium when immersed in an isotonic solution, where the concentration of solutes within and outside the cell are balanced. The frequent medical practise of using normal saline to keep the body's fluid balance is an example of an isotonic solution. Understanding cell physiology and the upkeep of homeostasis in biology depends on the use of isotonic solutions.
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according to the concept of punctuated equilibrium, the sudden appearance of a new species in the fossil record means that A. The Species Is Now Extinct
B. Speciation Accorued Instantaneously
C. Speciation Accorued In One Generation
D. The Species Will Consequently Have A Relatively Short Existence, Compered With Other Species
the right response is "C- Speciation Accomodated In One Generation."
Just what is a fossil record?
The fossil record can be used by palaeontologists, geologists, and archaeologists to better place notable events and species. The underlying principle of this theory is known as the Law of Superposition, which states that in undisturbed rock sequences, the lower layers are older than the upper ones.
This means that some fossil discoveries can be dated using the strata, or distinct stratum of rock, that they were found in. Fossil ages are frequently determined using radiocarbon dating. When this dating method was developed in the 1950s, palaeontology underwent a revolution and the fossil record's accuracy increased.
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Why do we turn paler in response to cold, and redder in response to heat?
In order to maintain the internal temperature, the blood vessels of your body constrict and narrow in cold environments. This minimizes that heat that is lost via your skin.As a result, the skin gets less blood and develops a bluish tint.
Why does skin get red in cold and hot temperatures?The body circulates blood towards the surface in an effort to warm itself when exposed to frigid conditions.Our skin is continually exposed to our surroundings, which is why we have red cheeks.
Why does cold skin become pale?Skin color changes correspond to the event's three phases.First, significant vasoconstriction restricts blood flow to the affected areas' skin, making the skin surface feel chilly to the touch and turning it white.Because there is little any flow of blood to the skin, it has a pale white tint.
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what is a common issue with recycling plastic grocery bags
The common issue in recycling plastic grocery bags is that they are made of polymers so they get tangled in the equipment.
Plastic bags and other film recyclables can not be reclaimed curbside because they get tangled up in the ministry at recovering installations, venturing workers and halting the recycling process. noway put plastic bags or film in your curbside recovering caddy. During processing plastic bags constantly get stuck in the outfit. So the inhibition can be removed, this means the ministry has to routinely be shut down.
The factual process of recovering plastic bags is time consuming and delicate, so numerous recycling installations don't process or accept plastic bags. Out of all the accoutrements that end up in our recycling lockers, plastic is presumably the most delicate to reclaim. This is because plastics are composed of several different polymer types. Hence, it's nearly insolvable to reclaim different plastics together as they melt at different temperatures.
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Mitotic cell division is never used by organisms as a means of reproduction.
Is this statement true or false?
False, In some organisms, mitotic cell division serves as a type of reproduction. Certain species can reproduce or produce new organisms by mitotic cell division. For instance, mitosis is the reproduction method used by single-celled eukaryotic creatures like amoebas.
Cell biology refers to the phase of the cell cycle where replicated chromosomes break into two new nuclei. In the process of mitotic cell division, genetically identical cells with a fixed number of chromosomes are created. Hence, equational division is another name for mitosis. Often, DNA replication takes place in the interphase S phase, which comes before mitosis. Normally, telophase and cytokinesis follow. During these processes, a cell divides into two new cells with nearly equal amounts of cytoplasm, organelles, and cell membrane.
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Carl wants to diagram a model of the flow of energy in a desert ecosystem. Will carl need to use a food chain or food web for the most accurate representation? Support your answer.
Answer: Yes!
Explanation:
Yes, Carl will need to use a food web for the most accurate representation. A food web is a complex diagram that shows the network of relationships between different organisms within an ecosystem, including producers, consumers, and decomposers. It accurately shows the flow of energy through a system and how different species interact with each other. A food chain, on the other hand, only shows the transfer of energy from one species to another in a linear fashion, which doesn't accurately represent the complexity of a desert ecosystem.
Yes, Carl will need to use a food chain or a food web for the most accurate representation of the flow of energy in an ecosystem.
What is the flow of energy in an ecosystem?In most of the natural ecosystems energy comes from the sun, and it is consumed by the producer organisms. It is then passed on to the successive trophic levels in the form of food. Hence, the energy flows from the prey species to the predator species, not in the reverse direction.
Carl will need to use a food web for the most accurate representation of energy flow. A food web is a complex network or diagram which shows the network of relationships between different organisms in an ecosystem within an ecosystem, including various organisms such as producers, consumers, and the decomposers.
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how many kingdoms are there in biological classification?
There are five kingdoms in biological classification proposed by R.H. Whittaker.
The process of organizing organisms on the basis of their similarities and differences is called classification. The recent accepted system of biological classification is the five-kingdom classification proposed by R.H. Whittaker.
Several characteristics, including mode of nutrition, thallus organization, cell structure, evolutionary relationships, and reproduction, served as the basis for this classification. Five kingdoms are included in this type of kingdom classification: Monera, Protista, Fungi, Plantae, and Animalia.
With the previous classification scheme, two extremely diverse organisms were placed together based solely on that one trait. As a result, all species were once again divided into the five kingdoms of the five-kingdom classification, beginning with Monera, which included all prokaryotic unicellular organisms.
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chordates possess several distinguishing characteristics that separate them from other animal groups. check all of the features that one would use to classify members into this phylum.
a. postanal tail
b. cranium
c. pharyngeal slits
d. notochord
e. dorsal hollow nerve cord
f. vertebral column
Chordates are a diverse phylum of animals that possess several distinctive features that distinguish them from other animal groups.
a. Postanal tail: Chordates have a tail that extends past the anus during some point in their life cycle, such as in fish and reptiles. The tail is used for locomotion and balance.
b. Cranium: Chordates have a head that is supported and protected by a skull or cranium, which is a bony or cartilaginous structure.
c. Pharyngeal slits: Chordates possess paired openings in the pharynx, the region behind the mouth, which are used for breathing, feeding, or communication.
d. Notochord: Chordates have a flexible, rod-like structure called the notochord that runs along the dorsal (back) side of their body. The notochord provides support and helps to maintain the body's shape.
e. Dorsal hollow nerve cord: Chordates have a tubular nerve cord that runs along the dorsal side of their body. This nerve cord is filled with cerebrospinal fluid and acts as the central nervous system.
f. Vertebral column: Chordates possess a segmented vertebral column or spine, which replaces the notochord in adult vertebrates. The vertebral column provides support and protection for the spinal cord.
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What is down regulation and up regulation?
The process by which a cell reduces the amount of a biological component, such as RNA or protein, in reaction to an external variable is known as downregulation.
Upregulation is the term used to describe a rise in a component. A mechanism for enhanced or decreased sensitivity to agonists and antagonist medications implies that decreased agonist exposure results in an increase in the number of receptors (upregulation), whereas greater agonist exposure results in a decrease in the number of receptors (downregulation) (downregulation).
Downregulation refers to a reduction in the number of receptors on the surface of target cells, which makes the cells less susceptible to a hormone or another substance.
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the shape of a red blood cell can be described as a ______ disc
Answer: biconcave.
Explanation:
which test is used for determining the ability of bacteria to break down protein? gelatinase test | Voges-Proskauer test | amylase test | Biochemical tests
Catalase-producing organisms are discovered using this assay. By dissolving hydrogen peroxide into water and oxygen, this enzyme detoxifies it.
Which test is performed to determine whether bacteria are able to digest protein?Two successive reactions occur throughout this process. Gelatinases break down gelatin to polypeptides in the first step. The polypeptides are subsequently transformed into amino acids. These amino acids can then be absorbed by the bacterial cells, who can employ those in their metabolic processes.
What is the purpose of a gelatinase test?To distinguish either S. aureus and Staphylococcus epidermidis, utilize the gelatinase test. Additionally, it can be utilized to distinguish Proteus mirabilis, Proteus vulgaris, and Serratia marcescens from other enterics.
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the main function of the cardiovascular system is to circulate ______ throughout the body.
The main function of cardiovascular system is to circulate the blood throughout the body.
What is the function of cardiovascular system?The main purpose of the cardiovascular system is to circulate blood throughout the entire body and it is made up of the heart and blood vessels. The heart is a very strong muscle that pumps blood throughout the body and blood vessels are the tubes that carry blood throughout body.
Circulatory system carries oxygen, nutrients and hormones to cells and also removes waste products like carbon dioxide. These travel in one direction only, so as to keep things going where they should.
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