AP (Advanced Placement) Biology: Questions 153 - 157 of 327

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Question number: 153

» DNA and Protein Synthesis

MCQ▾

Question

RNA is believed to be a more primitive molecule than DNA because

Choices

Choice (5) Response

a.

It uses a less complex base pairing system

b.

It lacks the base pairing system used by DNA

c.

It can have catalytic properties

d.

It is more flexible in structure

e.

It is always a much shorter molecule than DNA

Question number: 154

» DNA and Protein Synthesis

MCQ▾

Question

During PCR, what mechanism is used to separate the complementary DNA strands from each other?

Choices

Choice (5) Response

a.

The inclusion of bacterial ribosomes

b.

The melting capability of DNA polymerase

c.

The inclusion of restriction endonucleases

d.

Heating

e.

The addition of large amounts of sodium chloride

Question number: 155

» DNA and Protein Synthesis

MCQ▾

Question

In gel electrophoresis fragments are separated on basis of

Choices

Choice (5) Response

a.

Charge

b.

Size

c.

Both a. and b. are correct

d.

Question does not provide sufficient data or is vague

e.

None of the above

Question number: 156

» DNA and Protein Synthesis

MCQ▾

Question

Which of the following is the usual sequence of a pribnow box?

Choices

Choice (5) Response

a.

TTGACA

b.

TATAAT

c.

AUAUA

d.

UUUUU

e.

Question does not provide sufficient data or is vague

Question number: 157

» DNA and Protein Synthesis

MCQ▾

Question

During translation, how is the subsequent amino acid transferred from the tRNA that brought it into the ribosome to the nascent protein strand?

Choices

Choice (5) Response

a.

The transfer requires the expense of ATP to break one bond and form the other.

b.

Two proteins of the large ribosomal subunit facilitate the transfer from the tRNA to the polypeptide strand.

c.

The interactions of the proteins and rRNA of both ribosomal subunits physically distort the tRNA—amino acid bond to the breaking point, allowing its facilitated transfer to the polypeptide.

d.

The two are brought into close proximity, and the amino acid spontaneously joins the polypeptide due to hydrophobic interactions.

e.

The rRNA of the ribosome serves to catalyze the transfer from the tRNA to the polypeptide strand.

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