DNA and Evolution [Subject SAT (College Board) Biology]: Questions 6 - 8 of 134

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Question 6

DNA and Evolution
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Question

MCQ▾

Which one of the following is not uniform in all DNA molecules?

Choices

Choice (5)Response

a.

The pattern of the helix structure

b.

The arrangement of sugar-phosphate groups

c.

The sequence of nitrogenous bases on a strand of DNA

d.

The pairing of adenine with thymine and cytosine with guanine

e.

Question does not provide sufficient data or is vague

Question 7

DNA and Evolution
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Question

MCQ▾

Plasmid vectors utilized in cloning often contain a gene for the N-terminal 146 amino acids of the enzyme β-galactosidase. What is the purpose of including this gene in the vector?

Choices

Choice (5)Response

a.

It enables the plasmid vector to replicate in E. coli host cells.

b.

It allows selection of E. coli host cells that contain plasmid in which the insert has been ligated.

c.

It cleaves the insert to allow it to be ligated into the vector.

d.

It allows selection of E. coli host cells that contain the plasmid.

e.

Question does not provide sufficient data or is vague

Question 8

DNA and Evolution
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Question

MCQ▾

What is so true about viruses?

Choices

Choice (5)Response

a.

They can reproduce in non-living medium

b.

They are obligate intracellular parasites

c.

They cannot be crystallized and stored for years

d.

They contain both DNA as well as RNA

e.

Question does not provide sufficient data or is vague