Answer: In the nucleus of each cell, the DNA molecule is packaged into thread-like structures called chromosomes. Each chromosome is made up of DNA tightly coiled many times around proteins called histones that support its structure.
which is a type of star system?
A. dim stars
B. galaxies
C. wobbling stars
D. globular clusters
Answer:
D) Globular Clusters
Explanation:
A star system or stellar system is a small number of stars which orbit each other, bound by gravitational attraction. A large number of stars bound by gravitation is generally called a star cluster but, broadly speaking, they are also star systems. A star cluster is a group of stars that share a common origin and are gravitationally bound for some length of time. The two basic categories of stellar clusters are open clusters, also known as galactic clusters, and globular clusters.
Globular clusters is a type of star system.
What is star system?A star system, also known as a stellar system, is a group of stars that circle each other and are held together by gravitational pull. A stellar cluster or galaxy is a huge group of stars that are gravitationally bonded together, however they are also known as star systems. Planetary systems, which comprise planets and other similar bodies, are not to be mistaken with star systems such as comets.What is globular clusters?Globular clusters are clumps of old stars that are firmly packed together. They have a roughly spherical form and contain hundreds of thousands, if not millions, of stars. Astronomers can use them to determine the age of the cosmos or the location of a galaxy's core by studying them.Hence, the correct option is D.
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Caffeine prolongs and intensifies the effects of epinephrine. Which of the following potential mechanisms of action of caffeine is consistent with this effect?
a. inhibits cAMP phosphodiesterase, the enzyme that converts cAMP to AMP.
b. a competitive antagonist of cAMP binding to PKA.
c. stimulates phospholipase Cb.
d. inhibits sarcoplasmic/endoplasmic reticulum Ca 2 + - ATPase.
e. activates PKC.
Answer:
a. inhibits cAMP phosphodiesterase, the enzyme that converts cAMP to AMP.
Explanation:
The phosphodiesterases are a group of enzymes that are capable of breaking phosphodiester bonds such as those between nucleotides in nucleic acids. The Cyclic adenosine monophosphate (cAMP) is a second messenger involved in intracellular signaling pathways. This molecule (cAMP) is hydrolyzed by the cAMP-dependent phosphodiesterase, which catalyzes the enzymatic breakdown of phosphodiester bonds (i.e., hydrolyzing cAMP to 5-AMP). The cAMP levels are modulated by the balance between its generation and the degradation via cyclic nucleotide phosphodiesterase.
Cellular respiration and fermentation both --- A. begin with the breakdown of glucose in glycolysis B. produce the same number of ATP molecules C. only occur in animal cells D. require oxygen molecules as a reactant
Answer:
B
Explanation:
What are gyres?
1.Large plants that move in circles in the ocean.
2.Large circulating parts of the ocean
3.Large animals in the ocean that move in circles in the ocean.
Answer:
A gyre is a circular ocean current formed by the Earth's wind patterns and the forces created by the rotation of the planet..
Explanation:
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Jose Salazar has been hospitalized following a motor vehicle accident. He has several broken bones, including his left jaw, two ribs on the left side, and a compound fracture of his left leg. According to his medical record, he is 47 years old, his height is 5'9", and his weight is 171 pounds. During the course of his hospital stay, he was diagnosed with a heart arrhythmia. His current medications include lovastatin to lower his cholesterol, an MAO inhibitor to treat depression, and an analgesic to treat his pain. Mr. Salazar's wife also reports that he takes several herbal products including yohimbe, kava, valerian, and St. John's wort. Which herbal product taken by Mr. Salazar may be causing his heart arrhythmia?a. yohimbeb. kava kava onlyc. St. John's wortd. valerian onlye. both valerian and kava kava
Answer:
a. yohimbeb
Explanation:
Heart arrhythmia is a heart disease in which the heart does not work properly. The main cause of heart arrhythmia is yohimbeb which is used as a medicine for increasing sexual desires but this herbal product also has side effects such as causing heart problems such as heart arrhythmia and kidney diseases. So the Jose Salazar should avoid the consumption of yohimbeb in order to control the heart disease.
the area around a cell has a high concentration of sodium ions as a result the cell membrane expands and burst which problem was the cell most likely having
Answer:
Cell can't fix their internal osmotic state
Explanation:
Due to which it bursts and there is also another problem that water moves from hypotonic to hypertonic so water from cell move outside cell shrinks and die
3. Why are cilia and flagella important?
Answer:
Involved in the movement of body and capturing of food
Explanation:
What is enzyme specificity?
Answer:
This is the tendency of enzymes to catalyse a specific set of chemical reactions.
Explanation:
This is enzyme specificity.
which question most closely relates to the fosters observation and the collective scientific data on forest
Answer:
The options are:
A. Did a lack of Rain cause the hemlocks to stop reproducing?
B. Are deer eating most of the young hemlocks?
C. Do the young hemlocks have a disease?
D. Why are there so many deer in the forest?
The answer is B. Are deer eating most of the young hemlocks?
Hemlocks are referred to as plants which are considered poisonous when eaten by animals. Since Deers are herbivorous and eats plants alone then the most suitable option will be B which talks about if the deers are eating most of the young hemlocks as a result of it being closely related to the relates to the fosters observation and the collective scientific data on forest.
In Pennsylvania, wolves have been extinct for many years. They used to feed on white-tailed deer, but not that the wolves are gone, the population of white-tailed deer has exploded. This means that this community:______
a. Was under top down control
b. Was under bottom up control
c. Lacks a fundamental niche for wolves
d. Lacks a fundamental niche for deer
Answer:
The correct answer is a: The community was under top-down control
Explanation:
Top-down control refers to scenarios where superior predators control the structure and dynamic of an ecosystem. These systems are affected by the presence/absence of the superior predator influences all the lower links in the trophic chain.
In the exposed example wolves, that are considered to be the top predators, affected the white-tailed deer populations being the cause of its decrease. As wolves used to feed on white-tailed deer, they kept these populations under control, but once the wolves got extinct, the deer population increased again. Probably, this explosion in the deer´s population also affected its lower link in the trophic chain.
You are working as an intern in a small biotechnology company that is trying to develop genetic engineering approaches to improve the ability of humans to swim under water without SCUBA equipment or other sources of oxygen. As a physiologist, you realize that this problem has already been solved by marine mammals and birds who are able to function under water for extended periods of time. You decide to do some background research on diving mammals and birds and prepare a list of possible strategies to present at the next research staff meeting.State two possible strategies for enhancing the ability of humans to function under water without access to additional oxygen and briefly discuss why you think each strategy would be effective.
Answer:
1- By eating a supplement that enhances the ability of red blood cells to transport oxygen, thereby reducing the oxygen dependence
2- By developing structures that help to support high pressures, thus improving the ability to breathe in deeper marine habitats
Explanation:
Recently, it has been shown that beneficial mutations provided to marine mammals a biological adaptation associated with a higher ability to transport oxygen in red blood cells when compared to terrestrial mammals. This adaptation enables marine mammals to breathe less frequently to obtain the same amount of oxygen.
In birds, the airflow is unidirectional (i.e., inhalation and exhalation are complete), rather than mammals where the air in and out of the lungs. This mode of respiration helps the birds to tolerate the high pressures during flight.
The strategies for enhancing the ability of humans to function under water without access to additional oxygen will be:
Increased positively charged proteins known as myoglobin.Controlled breathing.It should be noted that one of the strategies for enhancing the ability of humans to function under water without access to additional oxygen will be controlled breathing.
Another factor that can be used is the increased level of haemoglobin content. Lastly, increase in myoglobin can be vital for this procedure too.
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Which step of desalination must be done before water is condensed and collected?
Water is heated until it evaporates.
Water is frozen, so it becomes ice.
Water is transported from one area to another area that has little water.
Water is collected and salt is allowed to settle at the bottom.
Answer:
Water is transported from one area to another area that has little water. Water is collected and salt allowed to settle at the bottom.
Explanation:
Desalination of water is a process of the removal of salts and minerals from the water. This process is used for the production of water suitable for human consumption or irrigation.
Natural desalination occurs trough the hydrologic cycle when seawater evaporates. On the other hand, manipulated desalinization is an energy expensive alternative to natural desalination.
Answer:
A. Water is heated until it evaporates.
Explanation:
Traditionally, the best way of taking salt out of water has been through vacuum distillation. The salt water is enclosed at a low pressure to reduce its boiling point, making it easier to vaporize to separate the salt from the water.
Question 21 (5 points)
Which of the following terms describes a collection of hollow cells that implants on
the uterus wall after fertilization, but is not yet differentiated (in other words, all cells
are the same type of cell still)?
Fetus
Haploid
Mitosis
Blastocyst
Answer:
The answer is option D.
Blastocyst
Hope this helps
Answer:
Blastocyst
Explanation:
Once an egg is fertilized by a sperm, it begins to divide by mitosis into a 2, 4, and then 8 celled structure. Eventually, this large collection of cells keeps dividing and becomes a hallow collection of undifferentiated cells called a blastocyst. The blastocyst will implant on the wall of the uterus where it will begin to grow and develop during pregnancy into a fetus.
Consider the following DNA molecule: 5' TTC CAT GGA 3' 3' AAG GTA CCT 5' If this molecule were transcribed, what would be the resulting RNA molecule
Answer:
DNA strand: 5' TTC CAT GGA 3'
RNA strand: 3' AAG GUA CCU 5'
Explanation:
From the DNA template, an RNA molecule will be transcribed that is single stranded. So, it will read off the code from the 5' to 3' strand of DNA to create the RNA molecule made of complementary bases, in triplet codons. The enzyme that carries out this function is RNA polymerase.
describe some of the basic trends in hominid evolution (brain size, jaw size, language, and manufacturer tools) using at least five sentences.
4. In the background, the presence of naturally occurring enzymes in fruits and vegetables was discussed. Using your results from this exercise as a basis to guide your thoughts, do you think that cooked, frozen, or raw fruits and vegetables would contain the most active enzymes?
Answer:
The fruits inside do not have enzymes, but if our body when digesting them, if these fruits are cooked they are much easier to digest by our digestive enzymes and if they are raw, digestion will be more laborious since it will have to break more masses chemicals that were not destroyed by cooking.
Regarding freezing, it does not intervene in digestion.
Explanation:
The cooking of vegetables or fruits like meats generates that some chemical unions are destroyed, thus exposing the most internal structures in enzyme activity.
Which is one way that analyzing ice benefits scientists who study ancient climates?
Scientists can analyze frozen volcanic dust to help predict eruptions.
Scientists can drill deep into the ice to collect ice cores.
Scientists can use pollen grains in ice to make inferences about the c
Scientists can study tree rings in ice to learn more about past climates.
ate area
Answer:
Scientists can drill deep into the ice to collect ice cores.
Explanation:
Scientists can drill deep into the ice to collect ice cores as this method helps to find out the past properties of the atmosphere and how it acted in the past.
It also ensures and explains how the climate was when there were precipitation which includes snow, rain etc and also how the size of ice sheets and glaciers have changed in the past in response to different climate and different eras.
the person above is correct
Explanation:
Blood is vital for transporting substances through the body. When a person bleeds, that person is hemorrhaging. Blood loss over 30% can be fatal if not replaced by a blood transfusion.
A. A person with type AB- blood could receive type B- blood, type A- blood, type AB- blood, or type O- blood.
B. A person with type O+ blood could receive type O+ blood or type O- blood.
C. A person with type A- blood could receive type A- blood or type O- blood.
D. A person with type B+ blood could receive type B+ blood, type B- blood, type O- blood, or type O+ blood.
Answer:
A and C
Explanation:
The signs for blood (positive or negative) from the donor always has to match the blood for the patient.
Type A- blood can only donate to A- blood or AB- blood.
Type B- blood can only donate to B- blood or AB- blood.
Type AB- blood can only donate to AB- blood.
Type O- blood can only donate to O- blood, AB- blood, A- blood, or B- blood.
Type A+ blood can only donate to A+ blood or AB+ blood.
Type B+ blood can only donate to B+ blood or AB+ blood.
Type AB+ blood can only donate to AB+ blood.
Type O+ blood can only donate to O+ blood, AB+ blood, A+ blood, or B+ blood.
In the intrinsic pathway, the reaction begins with clotting factors from the _.
Answer:
Clotting factors are circulating in the blood.
Explanation:
In the intrinsic pathway, the body is responding intravascular damage through binding of platelets, exposure of chemicals or even collagen from endothelial membranes. The most of the clotting factors are synthesized by the liver and circulate around the blood stream until they are needed or until they are degraded based off their half lives.
When the platelets start to aggregate they release chemicals and have proteins that can attract the clotting factors. In the intrinsic pathway, clotting Factor XII starts off the cascade. Hope that helped :)
The Hadza and the Datog are both groups of tribes in Africa. Which of these has the traditionally higher-starch diet?
Answer:
The Datog has the traditionally higher-starch diet.
Explanation:
The Datog has traditionally consume higher-starch diet than the Hadza. The people of Hadza tribe take their food from the forest including berries, fiber-rich tubers, honey and meat etc. They search the forest in order to obtain food for themselves and their families while the Datog people obtain food by planting starch rich crops such as maize, beans and millet. so we can say that the Datog people consume higher-starch diet.
a) _____ is used to find the gene that codes for a protein by matching amino acid sequences to codons, mRNA to cDNA, and cDNA to natural DNA. (1 point) g
Answer:
mRNA
Explanation:
Messenger RNA (mRNA) is a single-strand RNA derived from the process of transcription, in which one strand of DNA serves as template to synthesize this molecule. The mRNA has an identical sequence to the gene, with the exception of thymine nucleotides that are replaced by uracils. During this process, the RNA polymerase synthesizes a precursor mRNA molecule (pre-mRNA), which contains both intronic and exonic regions. Subsequently, the introns are eliminated by RNA processing enzymes in a process known as RNA splicing, thereby resulting in a mature mRNA. Finally, this mature mRNA is decoded by the ribosome during the synthesis of proteins in a process named translation. The translation involves another type of RNA molecule: the transfer RNAs (tRNAs), which recognize codons in the mRNA and act as adaptors by the incorporation of specific amino acids in the protein sequence.
Answer:
mRNA is the answer
Explanation:
A.p.e.x.
What is the savanna hypothesis? Group of answer choices Bipedalism was selectively favored because it helped our ancestors to stay cool in their warm environment. Bipedalism evolved in early humans that were monogamous, specifically to allow male human fathers to provision food and resources to human female partners.
Answer:
Both options are valid, since in the hypothesis of the savanna it was argued that humans acquired bipedalism to be able to self-supply their food more effectively, and to have less body surface area exposed to the sun.
Explanation:
The saban hypothesis is believed to have originated in the saban, with the Austrolopitecus africanus being forced to affect this domain, which is why it acquired this adaptation mechanism.
The savanna had high grasslands, which also led to collaboration in this regard since they could be better camouflaged.
In addition, the human began to defend with the limbs of the upper limb, triggering the canines to decrease in size since it is not used as a defense mechanism.
The canine is a tooth that helps to tear carnivorous food, that is why the human also begins to have a more varied diet of fruits and seeds and that it can reach and take the bones of the tree to increase its height due to bipedalism.
What kind of information does the nutrition facts give about requirements for essential nutrients?
Answer:
the percent of various nutirents in one serving.
Explanation:
If you look on the back of a food item you can read the different percentages of vitamins and other nutrients in the product.
The nebular hypothesis suggest that our solar system evolved from a huge
Answer:
The correct answer is - Rotating Cloud.
Explanation:
According to the nebular hypothesis presented by the Swedish philosopher Emanuel Swedenborg in 1734 that says that the Sun and all the other planets of our Solar System evolved from a giant cloud of molecular gas and dust. This huge cloud could have been the result of a shock waves from a supernova or any passing star, but the end result was a gravitational collapse at the center of the cloud.
Thus, the correct answer is - our solar system evolved from a huge Rotating cloud.
The result of mitosis is that the daughter cells end up with the same number of chromosomes that the parent cell had. Another way to maintain the number of chromosomes would be to carry out cell division first and then duplicate the chromosomes in each daughter cell. Do you think this would be an equally good way of organizing the cell cycle? Why do you suppose that evolution has not led to this alternative?
Answer:
No, it will not be good way of organizing the cell cycle, as cell division would occur first and duplicate the chromosomes later, it would lead to unequal distribution of chromosomes in the offspring.
E.g. let the parent cell has chromosomes A, B, C, D so when the cell will divide the chromosomes will be divided in two sets as: (A, B) and (C, D), the daughter cells will have one of these sets each. Later it will be duplicated then the result will be (A, A, B, B) and (C, C, D, D). But ideally it should be A, B, C, D, as this had not happened in the above case so the offspring or daughter cells would have half of the genetic code missing hence they could not survive in nature. That's why natural evolution had not led to this alternative.
What is the function of premolars and molars? Write the number of both teeth in each jaw
Answer:
The function of the molars and premolars is to chew the food. There is 4 premolars and 6 molars in each jaw. I hope it helps you....
Assume that a cell is carrying out its day-to-day activities. At one point, the nucleotides GAT are paired with the nucleotides CUA. This pairing occurred __________.
Answer:
Explanation:
Yes!
The highlighted structure contains part of the brain system that maintains cortical alertness. What is the name given to this brain system
Answer:
Reticular formation
Explanation:
The Reticular formation consists of nuclei which are connected together. They are found in the Brain Stem. The Brain stem and Reticular formation are also both found in the Medulla Oblongata.
They however contain rich volume of cells which helps in the cortical alertness and they also help in the control of the activities of the skeletal and some parts of the muscular system.
How does epithelial tissue respond to a bruise or wound?
Answer:
Epithelial tissue helps bruises and wounds by reducing the risk of infection.Explanation:
The “somatic” cells are different from the “gametes” in one specific way. What do somatic cells do that Gametes dont? A. Divide B. Get passed to offspring C.build the body D. Grow inflexible walls
Answer:
option B
Explanation:
Gametes are haploid because a sperm and an egg fuse during fertilization to create a new organism with diploid cells. Mutations in somatic cells can affect an individual organism, but they do not affect the offspring since they are not passed on during reproduction.