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tankabanditka [31]
3 years ago
7

Why must reverse transcriptase be used to create a eukaryotic expression library?

Biology
1 answer:
Ede4ka [16]3 years ago
5 0

Answer:

Option (d).

Explanation:

Genomic library may be defined as the total genome DNA of the organism. Reverse transcriptase is the enzyme used for the formation of DNA from the RNA molecule.

The eukaryotes DNA contain large number of sequences called introns that creates a problem in the construction of the eukaryote genomic library. This problem can be solved by creating the complementary DNA from the RNA molecule free from the introns.

Thus, the correct answer is option (d).

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Answer:

A

Explanation:

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3 years ago
What percentage of the atmosphere is<br> Nitrogen gas N2
mihalych1998 [28]

Answer:

78 percent

Explanation:

The air in Earth's atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen.

6 0
3 years ago
The atomic number, of an element, indicates​
Vinil7 [7]
The number of protons in the nucleus of the atom.
7 0
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In 2006, scientists found a fossil that seemed to have fish-like scales and four legs. It also had a bone structure in its neck
lianna [129]

Answer:

Option-C

Explanation:

Scientists found a fossil of a fish with four limbs or legs. The fossil was estimated to be around 375 million years old.  

The fossil showed the fins and scales of a fish but they also possess the bones of proto-wrist, shoulders and the elbow.

The presence of these bones can be a clue that the fish evolved the limbs to walk on the land and will later evolve into animals belonging to amphibians, reptiles and mammals. Therefore, the Tiktaalik is considered the missing link of how life evolved from water to land.

Thus, Option-C is correct.

4 0
3 years ago
a man is twice as old as his son.Five years ago the ratio of their ages was 9:4.Find the sum of their ages​
elena-s [515]

Answer:

75years

Explanation:

Let the Father's age be represented by 2x

Let the Son's age be represented by x

Five years ago;

Man's age will be = 2x - 5

Son's age will be = x - 5

If the ratio of their ages five years ago was 9:4, then;

2x - 5/x-5 = 9/4

4(2x - 5) = 9(x - 5)

8x - 20 = 9x - 45

- Collect like terms

-20 + 45 = 9x - 8x

25 = x

Hence, the son's age = 25 years

If x = 25, the father's age (2x) will be 2 × 25 = 50years

The sum of their ages will be = 25years + 50years = 75years

6 0
3 years ago
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