Question 1

Which of the following best describes the structure of a DNA nucleotide?

Accepted Answer

A nitrogenous base, a five-carbon sugar, and a phosphate group

Question 2

During DNA replication, which enzyme is responsible for joining Okazaki fragments on the lagging strand?

Accepted Answer

DNA ligase

Question 3

The semiconservative model of DNA replication results in daughter DNA molecules that:

Accepted Answer

Each contain one old strand and one newly synthesized strand

Question 4

Which of the following equations correctly represents the flow of genetic information in a cell?

Accepted Answer

$$DNA \rightarrow RNA \rightarrow Protein$$

Question 5

A mutation that substitutes one nucleotide for another in a gene can result in:

Accepted Answer

A change in a single amino acid in the protein

Question 6

Which process involves the synthesis of RNA using DNA as a template?

Accepted Answer

Transcription

Question 7

In eukaryotic cells, before mRNA leaves the nucleus, it undergoes several modifications. Which of the following is NOT one of these modifications?

Accepted Answer

Removal of exons

Question 8

Which of the following statements about the genetic code is correct?

Accepted Answer

It is nearly universal among all organisms

Question 9

A tRNA molecule has two important functional regions. What are they?

Accepted Answer

An anticodon and an amino acid attachment site

Question 10

Which of the following best describes the role of ribosomes in translation?

Accepted Answer

They coordinate the interaction between mRNA and tRNA and catalyze polypeptide synthesis

Question 11

Which of the following is the correct sequence of events in translation?

Accepted Answer

Initiation, elongation, termination

Question 12

A retrovirus, such as HIV, uses which enzyme to synthesize DNA from its RNA genome?

Accepted Answer

Reverse transcriptase

Question 13

Which of the following mechanisms allows bacteria to acquire new genetic material from their environment?

Accepted Answer

Transformation

Question 14

What is the function of R plasmids in bacteria?

Accepted Answer

They carry genes for antibiotic resistance

Question 15

Which of the following is a consequence of a frameshift mutation caused by the insertion or deletion of a nucleotide?

Accepted Answer

It alters the reading frame, potentially changing every amino acid downstream

Question 16

Which of the following best describes a prion?

Accepted Answer

An infectious protein that can cause brain diseases

Question 17

In the lytic cycle of a bacteriophage, what is the fate of the host cell?

Accepted Answer

It bursts, releasing new phages

Question 18

Which of the following is true about the lysogenic cycle of a bacteriophage?

Accepted Answer

Phage DNA integrates into the host chromosome and is replicated with it

Question 19

Which of the following best explains why the genetic code is described as a 'triplet code'?

Accepted Answer

Each codon consists of three nucleotides that specify one amino acid

Question 20

A scientist discovers a new virus that uses RNA as its genetic material and acquires a membrane envelope from its host. Which type of virus is this most likely to be?

Accepted Answer

An animal virus

Molecular Biology of the Gene: Structure, Replication, and Expression

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