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Anarel [89]
3 years ago
8

What is meant by Koch's postulates ?

Biology
1 answer:
nydimaria [60]3 years ago
3 0

Answer: four criteria to establish a causative relationship between a microbe and a diseases

Explanation:

1- "Bacteria must be present in every case of diseases"

2- "Bacteria must be isolated from the host with the diseases and grown in pure culture"

3- "The specific diseases must be reproduced when a pure culture of bacteria is inoculated into a healthy susceptible host"

4-"Bacteria must be recovered from the experimentally infected host"

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Which of the following is the most predictable outcome of increased gene flow between two populations?
Rudik [331]

Answer:

The correct answer is b. decreased genetic difference between the two populations

Explanation:

The gene flow between two population always reduce the genetic difference between the two population because it increases the homogeneity between the population.  

If there is greater gene flow between the two populations genes will be shared and transferred between the individual of two population which will make the two gene pool to become more and more similar.  

This will increase the fitness of both the population because more allele will add to the two populations. Therefore the correct answer is b.

6 0
3 years ago
Which of the following statements explains why there is an elastic layer found in arteries, but not veins? The total length of a
Dvinal [7]

Answer:

Blood pressure is higher in arteries than veins, and the elastic layer helps maintain the structure of the artery.

Explanation:

i think

4 0
3 years ago
Read 2 more answers
Suppose you discovered a mutant yeast whose glycolytic pathway was shorter because of the presence of a new enzyme catalyzing th
Ganezh [65]

Answer:

The correct answer is  the formation of pyruvate from glucose willl be energetically less favorable.

Explanation:

According to the question matunt yeast has a shorter glycolytic pathay catalysing a follwing reaction

 Glyceraldehyde-3-phosphate+H2O+NAD+  = 3-phosphoglycerate

So in the mutatant the formation of 1,3- bisphosphoglycerate is not occurring.The glyceraldehyde-3-phosphate is directly converted into 3-phosphoglycerate.

    As a result the substrate level phosphorylation step that deals with formation of 3-phosphoglycerate from 1,3  bisphosphoglycerate is not occurring.

  From this point of view it can be said that less energy will be formed in the mutant during glycolysis than that of normal one.

 So the formation of pyruvate from glucose will be energetically less favorable.

5 0
3 years ago
25. Review the graph below. Blue Jays and Robins do not interbreed. Assuming that both birds live in the same habitat, what woul
kolbaska11 [484]
We do quite often have mutt birds. (the correct name for such a mutt is a hybrid. <span>They are way more common than most people think, but unless you are a birdwatcher you probably wouldn’t even spot them. People often see an odd looking birds and simply think it’s a type they haven’t seen before, when in fact it is a hybrid of two well-known species. 

Having said that, for birds to hybridized they have to be fairly closely related to start with. Robins and blue jays are no more closely related than humans are to baboons. You wouldn’t expect a human and a baboon to be able to mate and produce babies would you? So no, robins and blue jays can’t interbreed.

However there are many different species of animal that CAN interbreed and produce offspring. But the different species need to be fairly closely related, far more closely than human and baboon… or a blue jay and a robin.

For example we can interbreed horses and donkeys to produce baby mules, and we can breed cattle and buffalo, or camels and llamas. And the same is true of birds. While blue jays can’t be bred with robins in the wild we quite frequently find mutt birds.

<span> Ducks are particularly noted for forming wild mutts and many if not all north American mallards for example are of mixed species ancestry.</span>


</span>
5 0
3 years ago
Blood type is a genetically determined trait. Two siblings donate blood and find out their blood types. The brother is Type A an
rjkz [21]

Answer:

C

Explanation:

The brother has different alleles for the blood type gene than his sister does.  Blood type is inherited from parents like many other traits that can be displayed on a punnet square.  Depending on what the parents blood type alleles were, the brother and sister could have different blood types.  

A different number of chromosomes doesn't lead to different blood types, so D is wrong.  And A is incorrect because the number genes also does not affect blood type.  And I think the blood type genes are on the same chromosome, so B is wrong.  C is correct because blood type is inherited by alleles, and different alleles can cause different traits, such as blood types.  

8 0
3 years ago
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