Question 1

Which of the following statements best describes bacterial transformation?

Accepted Answer

It is the uptake of naked DNA by a competent bacterial cell, followed by incorporation into the chromosome.

Question 2

During generalized transduction, which type of genetic material is transferred?

Accepted Answer

Any gene from the bacterial chromosome can be transferred.

Question 3

Which enzyme is responsible for degrading naked DNA during transformation experiments?

Accepted Answer

Deoxyribonuclease (DNase)

Question 4

In bacterial conjugation, what is the role of the F (fertility) plasmid in E. coli?

Accepted Answer

It directs the formation of the sex pilus and mediates DNA transfer between cells.

Question 5

Which horizontal gene transfer mechanism is sensitive to DNase addition?

Accepted Answer

Transformation

Question 6

A researcher wants to clone a gene into a plasmid vector. Which of the following is NOT a required feature of the plasmid vector?

Accepted Answer

A gene encoding DNase

Question 7

Which of the following best explains why conjugation can spread antibiotic resistance rapidly in bacterial populations?

Accepted Answer

Plasmids transferred by conjugation often encode resistance genes and can move between diverse bacteria.

Question 8

Which of the following scenarios best illustrates specialized transduction?

Accepted Answer

A bacteriophage integrates into the host genome and, upon excision, transfers only genes adjacent to its integration site.

Question 9

If a bacterial cell is treated with DNase during a transformation experiment, what is the expected outcome?

Accepted Answer

No transformation will occur because the naked DNA will be degraded.

Question 10

Which of the following is a key difference between generalized and specialized transduction?

Accepted Answer

Generalized transduction can transfer any gene, while specialized transduction transfers only specific genes adjacent to the prophage.

Question 11

A scientist observes that only a small fraction of the bacterial chromosome is transferred during a certain gene transfer event, and the process is not sensitive to DNase. Which mechanism is most likely responsible?

Accepted Answer

Generalized transduction

Question 12

Which of the following best describes the process of competence in bacteria?

Accepted Answer

The ability to take up naked DNA from the environment during transformation.

Question 13

In the context of horizontal gene transfer, which equation best represents the probability $P$ of a cell acquiring a new trait via transformation, given the concentration of DNA $[DNA]$ and the competence factor $C$?

Accepted Answer

$P = C 	imes [DNA]$

Question 14

Which of the following is TRUE regarding the transfer of the F factor during conjugation between F+ and F- E. coli cells?

Accepted Answer

A copy of the F factor plasmid is transferred to the F- cell, converting it to F+.

Question 15

Which of the following mechanisms is most likely to result in the transfer of antibiotic resistance genes between unrelated bacterial species in a hospital setting?

Accepted Answer

Conjugation via plasmids

Question 16

A plasmid vector used for cloning must contain which of the following to ensure that only bacteria containing the plasmid survive on selective media?

Accepted Answer

A selectable marker gene, such as antibiotic resistance

Question 17

Which of the following best explains why only a variable fraction of the chromosome is transferred during transformation?

Accepted Answer

The amount of DNA taken up depends on the size and integrity of the naked DNA fragments available.

Question 18

In a laboratory experiment, a student mixes DNase with a bacterial culture undergoing transformation. What is the most likely result?

Accepted Answer

The transformation frequency will decrease significantly.

Question 19

Which of the following is NOT a mechanism of horizontal gene transfer in bacteria?

Accepted Answer

Binary fission

Horizontal Gene Transfer in Bacteria: Mechanisms and Applications

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