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2 years ago

Please help me its due in 20 minutes

Biology

2 answers:

Tpy6a [65]2 years ago

5 0

D arteries carry blood back to the heart

Ratling [72]2 years ago

3 0

Answer:

Explanation:

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Which example of artificial selection is caused indirectly by human activity?

kompoz [17]

The artificial selection is a procedure of selectively breeding certain species of plants and animals in order to develop certain desirable traits. Artificial selection helps the humans to get the plants or livestock that are the most useful for them. Among the given options, the choosing of the sheep giving the most wool, mating of the goats producing more milk, and mating of the ducks to produce large eggs are all examples of the deliberate artificial selection.

But the using of the fishing nets that are catching only the large crabs is an example of indirect artificial selection as it leads to the increased population of small crabs.

Hence, the correct answer is 'option d'.

8 0

2 years ago

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How many chromosomes do humans have in each cell?

cricket20 [7]

In humans, each cell normally contains 23 pairs of chromosomes, for a total of 46.

3 0

2 years ago

The following relationships are known: CGG specifies Arginine, GGC specifies Glycine and GCG specifies Alanine. Based on your kn

shtirl [24]

Answer:

Arginine

Explanation:

A specific genetic code specifies a particular amino acid. One amino acid can be encoded by more than one genetic code.

When a particular amino acid is encoded by more than one genetic code, all the genetic code for that amino acid mostly share common first two bases and differ from each other in the last base. This allows the same tRNA with particular anticodon to read all the possible genetic code for that amino acid and to serve as a carrier due to wobble base pairing.

Given that code "CGG" specifies arginine, the code "CGA" should also specify "arginine" since both differ with respect to the last base only.

3 0

2 years ago

Which weather state is most likely to cause an increase in precipitation?

Dmitriy789 [7]

C is the answer to this

8 0

2 years ago

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You learn that a Mars lander has retrieved a bacterial sample from the polar ice caps. You obtain a sample of these bacteria and

Misha Larkins [42]

Answer:

a. conservative replication

b. semi conservative replication

c. dispersive replication

d. discontinuous replication

e. continuous replication

The CORRECT ANSWER IS C.

c. dispersive replication

Explanation:

The attached image shows a single band that becomes lighter (in volume) and increase in darker intensity (in times of color) is revealed with consecutive replications. The major pattern that would produce these outcome is dispersive replication.

Conservative replication do reveal two bands (a 14N for the wholly latest molecule, and a 15N for the totally antiquated molecule) after the initial replication. Therefore, this wholly wrong.

Semi-conservative replication reveal an individual band of transitional weight after the initial replication, followed by two bands following the second replication (one of transitional weight, and the other at the 14N position). These two bands is observed in each following replication, with the transitional weight becoming lighter in color as the 14N band is seen to appear darker in color.

The real pattern gives an individual band that pinpoints to all molecules in an individual replicative cycle possessing the same constituents.

Dispersive replication, has its molecules to be a blend of old (15N) and new (14N) strands. Each replication raises the ratio of new to old strands as it explains the reason an individual band is shown raised (lighter in weight) with every replication.

4 0

3 years ago