Question 1

Which enzyme is primarily responsible for unwinding the DNA double helix during replication?

Accepted Answer

Helicase

Question 2

During DNA replication, which strand is synthesized discontinuously, resulting in Okazaki fragments?

Accepted Answer

Lagging strand

Question 3

Which of the following best describes the function of DNA ligase during replication?

Accepted Answer

Joins Okazaki fragments together

Question 4

A mutation in the gene encoding primase would most directly affect which step of DNA replication?

Accepted Answer

Formation of RNA primers

Question 5

Which equation correctly represents the complementary base pairing in DNA?

Accepted Answer

$$A = T$$ and $$G = C$$

Question 6

In a scenario where a cell lacks functional telomerase, what is the most likely consequence after several rounds of cell division?

Accepted Answer

Chromosome ends will progressively shorten

Question 7

Which of the following best explains how gene regulation can result in different cell types from the same DNA sequence?

Accepted Answer

Gene expression is controlled by regulatory proteins and signals

Question 8

A researcher observes that a certain gene is only expressed in liver cells but not in skin cells. Which mechanism most likely explains this observation?

Accepted Answer

Cell-specific transcription factors binding to the gene's promoter

Question 9

Which of the following is a key difference between lytic and lysogenic viral cycles?

Accepted Answer

Lysogenic cycle allows viral DNA to remain dormant within host genome

Question 10

Which part of a retrovirus is responsible for converting its RNA genome into DNA?

Accepted Answer

Reverse transcriptase

Question 11

Transposons are best described as:

Accepted Answer

Self-replicating DNA sequences that can move within the genome

Question 12

Which of the following diagrams best represents the structure of a typical virus?

Accepted Answer

A protein capsid enclosing genetic material, sometimes surrounded by an envelope

Question 13

Stem cells are unique because they:

Accepted Answer

Can differentiate into multiple cell types

Question 14

During organogenesis, which process is most critical for the formation of distinct tissues and organs?

Accepted Answer

Cell differentiation and signaling

Question 15

A scientist clones a gene using recombinant DNA technology. Which enzyme is essential for joining the gene of interest to a plasmid vector?

Accepted Answer

DNA ligase

Question 16

If a virus lacks a functional envelope, which of the following is most likely affected?

Accepted Answer

Ability to enter host cells efficiently

Question 17

Which formula correctly represents the calculation of DNA content after one round of replication, assuming semiconservative replication?

Accepted Answer

$$N_{final} = 2 	imes N_{initial}$$

Question 18

Which of the following best describes the role of transcription factors in gene regulation?

Accepted Answer

They bind to specific DNA sequences to increase or decrease gene expression

Question 19

A patient is diagnosed with a genetic disorder caused by a transposon insertion in a critical gene. What is the most likely effect?

Accepted Answer

The gene's function may be disrupted, leading to disease

Question 20

Which process is essential for the maintenance of stem cell populations in adult tissues?

Accepted Answer

Self-renewal

General Biology: Exam 4 Study Guide – Replication, Gene Regulation, Viruses, and Development

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