Myelin, which is composed of Schwann cells, is an insulating layer that surrounds portions of the brain's axons. A protective covering known as myelin is produced by Schwann cells in the peripheral nervous system.
What does myelin mean?A protective layer or sheath called myelin develops around nerves, including those in the brain and spinal cord. It is composed of fatty and protein components. Electrical impulses may move swiftly and effectively along nerve cells because to its myelin layer.
Schwann cells make myelin in the peripheral nervous system (PNS: nerves) and oligodendrocytes in the central nervous system (CNS: brain and spinal cord). In the PNS, one Schwann cell forms a single myelin sheath
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how is the rate of photosynthesis affected when leaf disks are exposed to different concentrations of bicarbonate solution?
The rate of photosynthesis affected when leaf disks are exposed to different concentrations of bicarbonate solution when the leaf disks immersed in the solution with the highest proportion (0.8% sodium bicarbonate solutions) rose in an average time of 4.91 minutes. This experiment demonstrates that the rate of photosynthesis can increase when there is more carbon dioxide present.
Photosynthesis- The method through which certain living animals and green plants convert sunlight into chemical energy. In green plants, visible light is gathered and utilized during photosynthesis to transform water, carbon dioxide, plus carbohydrates to make the glucose molecule. The photosynthesis occurs in two ways either PSI or PSII.
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When an animal is hungry it hunts for food. In this case, what is the stimulus?A. hungerB. hunting
And stimulus is a change in the organism or the environment that triggers a reaction, in this example, hunger causes the animal to hunt, so hunger would be the stimulus.
What molecule fits easily through the cell membrane's phospholipid bilayer?
A Protein
B Oxygen
C Glucose (Sugar)
D Salt
Answer:
B
Explanation:
since gases can pass through the phopholipids bilayer :)
Oxygen and carbon dioxide molecules pass freely through cell membranes. Which factor determines thedirection most molecules will pass through the cell membrane?A the strength of the covalent bonds holding the gas atoms in the molecules.B the concentration of the gas molecules on each side of the membrane.the ionic charge on the outer shell of the gas molecules.D the size of the gas molecules.
There are three factors that determine whether a molecule can pass through a cell membrane: concentration, charge and size. The greater the difference in concentration, the more rapid the diffusion. Large and heavier molecules more more slowly so they diffuse more slowly.
B. the concentration of the gas molecules on each side of the membrane.
How many daughter cells are produced by the end of Mitosis?
A 1
B 2
C 3
D 4
Answer:
it produces two (2) daughter cells
What is the function of the ozone layer?A. To absorb carbon dioxide.B. To trap infrared radiation.C. To block UV radiation.D. To recycle sulfur dioxide.
The correct answer is C. To block UV radiation. Ozone filters the majority of UV spectra, so it protects organisms from its effects.
Properties of Matter Unit Test
7 of 117 of 11 Items
Question
Which of the following statements is true?(1 point)
Responses
The density of water is 1 gram per milliliter, so objects with a relative density of 1 milliliter per gram will float.
The density of water is 1 gram per milliliter, so objects with a relative density of 1 milliliter per gram will float.
The density of water is 1 gram per milliliter, so objects with a relative density greater than 1 gram per milliliter will float.
The density of water is 1 gram per milliliter, so objects with a relative density greater than 1 gram per milliliter will float.
The density of water is 1 gram per milliliter, so objects with a relative density greater than 1 gram per milliliter will sink.
The density of water is 1 gram per milliliter, so objects with a relative density greater than 1 gram per milliliter will sink.
The density of water is 1 gram per milliliter, so objects with a relative density less than 1 gram per liter will sink.
The statement that is true is as follows: the density of water is 1 gram per milliliter, so objects with a relative density greater than 1 gram per milliliter will sink (option C).
What is density?Density is the measure of the mass of matter contained by a unit volume. The density of a liquid substance is a determinant of whether the substance will float or sink in water.
Water is a liquid substance with a density of 1 gram per millilitres (1 g/mL). This suggests that any substance with greater density than that of water will sink while any substance with lesser density than water will float.
Density is a measure of how heavy something is compared to its size, hence, if an object is more dense than water it will sink when placed in water, and if it is less dense than water it will float.
Therefore, according to this question, objects with a relative density greater than 1 gram per milliliter will sink.
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True or false? Having an autoimmune disease will eventually lead to death.Select one:TrueFalse
Answer: False
Explanation: Having an autoimmune disease will not necessarily lead to death, many of them have a treatment which allows the patient to maintain his/her quality of life.
How far apart has Africa and North America move apart since 2001
Africa and North America have moved apart since 2001 by a total of about 21 inches.
What is a Continent?This comprises of about seven landmasses on the earth which is usually very large and discrete and comprises of different countries. Examples include Africa, Asia, North America, South America etc.
Continents in the world such as Africa and North America move apart since 2001 at a rate of 1 inch per year. Since we were told that it occurred in 2001 then the total years in which it occurred is 21 then =
1 inch × 21 = 21 inches.
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Draw comic strip should include an example of transcription (DNA to mRNA) and an example of translation (mRNA to amino acid, and include tRNA) as well as the location of both in the cell.
We have to consider that the DNA is first transcribed into pre mRNA in the nucleus of the cell by the RNA polymerase. After this process, the non-coding fragments (introns) of the molecule are spliced by ribonucleoproteins (snRNP). Eventually, each end of the pre mRNA is modified, being a modified nucleotide named CAP joined to the 5' end, and a polyA (poly Adenine) tail at the 3' end before the now matured mRNA gets out of the nucleus to the cytoplasm.
At this point, the mRNA will be recognized by ribosomes, which will synthesize each group of three nucleotides (codons) into amino acids in a process called translation, by the action of tRNA, and finally joined into a new protein.
Note that A, P, and E are sites of the ribosomes, being A the position where first arrives the mRNA.
Which gas is transported by the circulatory system in humans and is USED BY cells during respiration to release energy stored in food? *A Carbon DioxideB NitrogenC HydrogenD Oxygen
In order to answer this question, we must remember a bit of cellular metabolism, when mitochondria carry out the process of cellular respiration we can see that in the electron transport chain the final acceptor of electrons is oxygen. Therefore the correct answer for the question is option D oxygen.
Two black guinea pigs were mated and produced 29 black and 9 white offspring. What were the genotypes of the parent guinea pigs? What are the expected phenotypic and genotypic ratios of the offspring?
If the mating of 2 black guinea pigs produced 29 black and 9 white offspring, the genotypes of the parents would be heterozygous.
Expected phenotype ratio = 3:1 black to white
Expected genotypic ratio = 1 AA:2Aa:1aa
Monohybrid crossingThe mating of 2 black guinea pigs produced 29 black and 9 white offspring. The parents must be heterozygous.
Assuming the allele for the black trait is A while that of the white trait is a. The cross is between Aa and Aa.
Aa x Aa
AA Aa Aa aa
The black allele is assumed to be dominant over the white allele. Thus:
Phenotype ratio = 3:1 black to white.
The ratio of the offspring produced from the mating is 29 black to 9 white, which is roughly 3:1. Thus, the mating is between two heterozygous black individuals.
Expected phenotype ratio = 3:1 black to white
Expected genotypic ratio = 1 AA:2Aa:1aa
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Help assp…..
What are the divisions of the PNS? (Choose all that apply)
A.autonomic nervous system
B.reflex arc
C.parasympathetic nervous system
D.somatic nervous system
it is B C and D
Hope this helps
Reflex arc, parasympathetic nervous system and somatic nervous system are the divisions of peripheral nervous system.
What are the functions of peripheral nervous system?The peripheral nervous system is one of two components that make up the nervous system of bilateral animals, with the other part being the central nervous system. The PNS consists of nerves and ganglia, which lie outside the brain and the spinal cord.
The peripheral nervous system refers to parts of the nervous system outside the brain and spinal cord. It includes the cranial nerves, spinal nerves and their roots and branches, peripheral nerves, and neuromuscular junctions.
The peripheral nervous system is divided into two main parts: Autonomic nervous system (ANS): Controls involuntary bodily functions and regulates glands.
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• How do you think the concept of the speed of light helps astronomers study the universe?Is the
speed of light in a vacuum the same regardless of where an observer stands? Explain your answer.
PLEASE HELP ME!!!!!
The cosmos is expanding at the quickest rate that astronomers have discovered. In actuality, nothing is known to move faster than the speed of light, which acts as a cosmic speed limit.
Regardless of the mobility of the source or the viewer, the in a vacuum remains constant for all observers.
What does the idea of light speed mean?
speed of light, the rate at which light waves move through various substances. Specifically, the speed of light in a vacuum is presently calculated to be 299,792,458 meters per second. One of nature's basic constants is the speed of light.
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Fungi exist as single cells or as branching networks of multicellular filamentswith a very large surface area. What is the function of the filaments?A. ReproductionB. Nutrient absorptionC. Energy productionD. Photosynthesis
Micelium, which is formed by a number of filaments, has the main function of penetrating the substrate in search of food and nutrient. Moreover, it can suffer some modifications to form reproductive structures.
The correct option is: B. Nutrient absorption.
ou are testing a patient's fecal sample for the presence of Clostridium difficile. Which of these staining procedures would give you the best evidence that the patient's sample contains bacteria from the Clostridium genus? Group of answer choicesendospore staingram stainsimple stainacid fast stain
As a protocol, the sample must first undergo primary biochemical tests, one of which is gram staining. And although this stain can help us to identify bacteria of the Clostridium genus, such as gram + sporulated bacilli, a more specific test would be the endospore stain, since the clostridium genus produces endospores that are also easy to isolate, since they are more resistant to temperature than the vegetative form (not sporulated) of the bacterium. An example would be the Schaeffer-Fulton stain.
3. What did you leam about the effects of salinity on of CO₂ on pH and how that Impa levels?
Answer: When CO2 is absorbed by seawater, a series of chemical reactions occur resulting in the increased concentration of hydrogen ions. This process ...
Explanation:
4. All enzymes have an optimal temperature at which they work as well as an optimal pH for their activity. Does this mean that enzymes only work at those specific temperatures and pH optimums? Briefly explain your answer using evidence from the unit that supports your answer.
Enzymes perform their functions within a specific temperature and pH range (which is specific for each enzyme in particular). In turn, within this range, there is a specific value at which they act in the most efficient way possible, which does not mean that they cannot on other values in the range. However, outside the limits of the range, the internal characteristic of enzymes can be affected and cause their denaturation, thus losing their capacity of action.
Explain at the chemical level why plants die when they are not watered.
Your answer must explain the importance of water to photosynthesis and
describe specifically how photosynthesis would be affected and
effectively shut down with the loss of water.
Answer:
All living things need to water to survive. This is because all living things are mostly made of water and since they lose water in different ways, they need to get more water to stay the same size. So if a plant does not get enough water, it will shrink. If it goes long enough without water it will die because the plant uses water for a lot of different jobs needed to keep the plant alive.
Evaluate the rate of cell division over time.
(This is for a project about cell division using gizmo for different diagrams and this is the final question needing to be answered in 3-5 sentences. all I have so far is that the rate goes up over time but dont know what else to put)
The rate of cell division over time is calculated as an average for the entire meristem by dividing it with the total cell flux. Total cell flux may be characterized as the number of cells in the meristem.
What is Cell division?Cell division may be defined as a type of biological process through which a parental cell divides into two or more daughter cells. There are two types of cell division are there:
MitosisMeiosis.According to the context of this question, the availability of the nutrient plays an active role in the process of cell division. It can increase the population of cells by doubling the rate of promoting growth and division of respective cells.
Therefore, the rate of cell division over time is calculated as an average for the entire meristem by dividing it with the total cell flux.
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1. Where is the thalamus located?
A.The cerebellum
B.The cerebrum
C.The brain stem
D.The diencephalon
D. the diencephalon is where the thalamus is located
how could the differences in these pictures be related to evolutionary fitness?
To be considered as fit for evolution processes, a species must be able to adapt in its environment and with capacity to reproduce sucessfully. Ambrosia, for example, is an invasive species. It has the abillty to promote accelerated evolution due to its adaptibility to its environment. Zea mays is an excellent species for genetic analysis. Quercus also has evolutionary potential because of its physiological characteristics.
A serum amylase is diluted 1/100 with a result of 45.0 U/L. What is the patient's actual amylase result?
A serum amylase is diluted 1/100 with a result of 45.0 U/L. The patient's actual amylase result is 4500 U/L.
Serum- Serum generally refers to the transparent fraction of any biological fluid, whether it comes from an animal or even a plant. For instance, the fluid released by serous glands is known as mammal serous (or serosal) fluid. The serum in blood is a clear, pale yellow liquid that is separated from of the blood and thus is free of blood cells & clotting components.
Amylase- The primary job of amylases is to hydrolyze all glycosidic linkages in molecules of starch, turning them to simple sugars. The three primary kinds of amylase enzymes—alpha, beta, and gamma—each affect the carbohydrate molecule in a different way.
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What is the name of the southern part of South America?
Answer:
Patagonia is the southern psrt of south america.
I need help with this practice problem solving My questions for you are at the top
Hi. We just had a session with this same question is there any doubt left?
PLS HELP FIND CONTOUR INTERVAL N ILL MARK BRANLIEST!!
Directions: Study the contour map below. Using the contour map and what you learned
from the lesson, complete the questions below. When your report is finished, submit it to
the Topographic Maps Lab dropbox for grading. This assignment is worth 20 points.
A biologist found an asymmetrical organism. A part of the organism was injured, but it was able to repair itself through regeneration.
Because the organism is asymmetrical and it was able to regenerate, it’s probably
.....
, and belongs to the phylum
....
.
Answer: 1. The right answer is amphibian.
2. The right answer is Mollusks.
Explanation:
1. Regenerating a limb is not possible in mammals, as in most vertebrates. But in amphibians such as the salamander yes!
This amphibian does it very well, capable of making tail, eye or snout too. For a very long time, scientists have been trying to understand this secret of the salamander, or that of the zebrafish, because the answer is scientifically interesting but also, of course, because we can hope to take advantage of it to imagine one day of medical treatment for injured members. Just over a year ago, an Australian team showed the role of macrophages, cells of the immune system.
2. Mollusks (Mollusca) are a branch of Lophotrochozoans animals. They are unsegmented animals, with bilateral symmetry sometimes altered. Their body usually consists of a head, a visceral mass, and a foot. The visceral mass is covered in whole or in part by a mantle, which secretes a calcareous shell. The nervous system includes a double periesophageal collar. The general cavity is more or less reduced to pericardium and nephridia.
What surface can only vacuum metal deposition be used on?
Porous surfaces
Non-porous surfaces
Metals
Fabrics
The surface that only vacuum metal deposition can be used on is option B: Non-porous surfaces.
What are Nonporous materials?Nonporous materials are substances that do not permit the passage of liquid or air. Nonporous materials are those that are not porous, such as glass, plastic, metal, and varnished wood.
Note that Vacuum lifting nonporous materials is much simpler than vacuum lifting porous surfaces, as the definition suggests. A proven method for creating latent fingerprints on non-porous surfaces is vacuum metal deposition (VMD).
Therefore, A variety of displays, such as flexible plastic packaging, plastic bottles, glass, and others, respond best to vacuum metal deposition (VMD).
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If a city
were a model for a cell,
would wastewater be more
likely part of endocytosis or
exocytosis? Explain.
If a city were a model for a cell, would wastewater be more likely part of endocytosis.
Briefing:The process of engulfing an object or particle with the cell membrane and bringing it inside the cell is known as endocytosis. The membrane completely encloses the substance by folding it over.
What is an endocytosis ?Endocytosis is the process by which cells take in foreign material by encasing it in their membrane. The two primary kinds of endocytosis are ocytosis and receptor-mediated endocytosis.
What is endocytosis transport?Endocytosis is a term that refers to a variety of active transport processes that carry particles into cells by encasing it in vesicles made of plasma membranes (endo = internal, cytosis = transport mechanism).
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Earth's___ and _____ affect the relative amounts of solar radiation regions receive
Earth's distance and tilt affect the relative amounts of solar radiation regions receive.
Explanation:Earth's distance and tilt affect the relative amounts of solar radiation regions receive. There are no options provided in the question, but this is the correct answer. The earth's orbit is not circular and the earth rotates in a tilted orbit. Whenever the south pole is tilted towards the sun, then the south pole will get more solar radiation than the north pole. The Earth absorbs most of the energy reaching its surface and a small fraction is reflected. In total, approximately 70% of the incoming radiation is absorbed by the atmosphere and the Earth's surface while around 30% is reflected back to space and does not heat the surface.