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Verdich [7]
3 years ago
8

What is meant by a mechanism of evolution?

Biology
1 answer:
Effectus [21]3 years ago
6 0

The mechanisms of evolution allow evolutionism to be explained according to the scientific method. Through the mechanisms of evolution we can understand how the equilibrium in a population is changed and the consequences that this change causes.

The most important mechanisms of evolution include:

  • Trial and error: It is the simplest of all methods of evolutionism; in principle it is typical of microorganisms with a lot of progeny in each generation and relies on the later mechanism of natural selection.
  • Natural Selection: In the strict and exclusive sense, it would act as the only method of effective evolution, since random modifications alone would not achieve the observed evolution of living beings. Assuming the randomness of modifications, the earlier trial and error method would be more general than natural selection, since it does not always operate.  Natural selection is characterized as a method of verification exogenous to the evolutionary system itself or the system of creation of genetic modifications, as it acts “a posteriori”.
  • Exhaustive proof or simulation: Of the results predicted by the genetic modifications made. In certain cases, living organisms may prove the effect of replacing, for example, one protein with another, if the evidence is satisfactory with respect to the functionality of the new mechanism of evolution; and there is no risk of having side effects on suppression of the first protein, genetic modification could be carried out without major problems as the guarantee objective would be fully covered.
  • Partial Proof of Modifications: When an evolutionary system is complicated and contains many interrelationships, exhaustive proof of the effects of a small modification will not be possible and will have to be limited to more or less extensive but not total proof. To the extent that the range of possible effects of genetic modification has been covered, it will carry greater or lesser risk. The risks of this method are very well known to computer programmers.

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Answer:

IgM

Explanation:

The first molecular mechanism of adptative immunity to appear is IgM. These molecular pentameric (constituted of 5 smaller units), are produced in the macrophages of the organism and are released when some time has elapsed since the beginning of the infection (latency period). By having 5 possible epitopes, it increases the chances of triggering a cell-mediated immune response and stimulating the production of IgG.

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The urinary bladder is a muscular sac. This helps the urinary bladder
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The correct answer is B. 
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1. A mutant form of LDH in which Arg109 is replaced with Gln shows only 5% of the pyruvate binding and 0.07% of the activity of
Alex787 [66]

Answer:

It is a replacement that has an important effect on protein function because Arg and Gln are residues with different chemical properties.

Explanation:

In this case, Arginine (Arg) is a basic and positively charged residue, while Glutamine (Gln) is an uncharged (neutral) amino acid. Non-conservative substitutions like that are generally expected to have deleterious effects and they are generally removed by natural selection. Moreover, Arg is also a target for phosphorylation, which is the most important posttranslational modification. Phosphorylation is known to be capable of causing the activation of different proteins, especially kinases, and, therefore, the mutation at Arg109 might also inactivate the active site of this protein.

4 0
3 years ago
Study of human evolution tells us that we are descended from ancestors who were arboreal, that is, who were adapted to living in
9966 [12]

Answer:

Please see below

Explanation:

The original primates' key adaptations to their arboreal life way included binocular vision to judge depth and be able to jump to the next brach without falling to a certain death; an opposable thumb, to be able to hold to a branch with a secure grip, and arms longer than legs to swing from branch to branch. This forced them to walk on all fours but it wasn't disadvantageous because they went down to the floor for short periods. During their transformation to humans which resulted from their invading a new habitat in the more open grassy savannas, the opposable thumbs allowed them to use tools, like rocks and sticks which they could use to get food and defend against their enemies. They had to walk upright on two legs, to be able to see afar and locate potential food or predators, so natural selection eventually resulted in longer legs and a modification in the backbone. The significance of this evolutionary history is that modern humans are what they are as a result of a combination of preadaptations from their arboreal ancestors and the new features that resulted from their new habitat on the open ground of the savanna.

4 0
3 years ago
Give an example of how Eubacteria can be beneficial. Explain. Please help me. ​
lesantik [10]

Answer:

Some bacteria are good for you, including the bacteria in your digestive system, or gut. These bacteria help to break down food and keep you healthy. Other good bacteria can produce oxygen are used to create antibiotics. Bacteria are used in food production to make yogurt and fermented foods.

6 0
3 years ago
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