Question 1

Which of the following is NOT a type of transcriptional regulation in bacteria?

Accepted Answer

Alternative splicing

Question 2

Quorum sensing in bacteria primarily allows cells to:

Accepted Answer

Detect and respond to population density using signaling molecules

Question 3

Which mechanism of horizontal gene transfer involves the uptake of free DNA from the environment?

Accepted Answer

Transformation

Question 4

A mutation in the promoter region of a bacterial gene is most likely to:

Accepted Answer

Affect the transcription rate of the gene

Question 5

Which of the following statements about bacterial genetic adaptability is TRUE?

Accepted Answer

Bacteria can rapidly adapt due to high mutation rates and horizontal gene transfer

Question 6

During generalized transduction, what is mistakenly packaged into a phage particle?

Accepted Answer

Random fragments of the bacterial genome

Question 7

Which equation best represents the frequency of spontaneous mutations per cell division in a given gene?

Accepted Answer

$$10^{-6} to$$ $$10^{-7}$$

Question 8

What is the role of RecA protein in bacterial transformation?

Accepted Answer

It facilitates homologous recombination between incoming DNA and the chromosome

Question 9

Which of the following is a consequence of a mutation that changes a wobble base in a codon?

Accepted Answer

It may not change the amino acid sequence of the protein

Question 10

A bacterial cell is described as 'competent.' What does this mean?

Accepted Answer

It can take up free DNA from the environment by transformation

Question 11

Which process requires cell-to-cell contact for horizontal gene transfer in bacteria?

Accepted Answer

Conjugation

Question 12

If a mutation arises in a haploid bacterial cell, what is the most likely immediate effect?

Accepted Answer

The mutation will be expressed in the phenotype

Question 13

Which of the following is NOT a fate of foreign DNA introduced into a bacterial cell?

Accepted Answer

Immediate expression as a protein without transcription

Question 14

Which of the following best describes the function of sigma factors in bacterial transcription?

Accepted Answer

They help RNA polymerase recognize and bind to specific promoter sequences

Question 15

A bacterial population of $$10^8$$ cells is grown. If the mutation rate per gene per cell division is $$10^{-6}$$, approximately how many mutations would you expect in that gene?

Accepted Answer

$$10^2$$

Question 16

Which of the following is a real-world example of how horizontal gene transfer can impact bacterial fitness?

Accepted Answer

Acquisition of antibiotic resistance genes from unrelated bacteria

Question 17

Which of the following is TRUE about generalized transduction?

Accepted Answer

Any part of the bacterial genome can be transferred by a phage

Question 18

Which of the following is a plausible outcome of a mutation in the DNA region between neighboring operons in bacteria?

Accepted Answer

It probably won't cause a problem unless it affects a regulatory element

Question 19

Which of the following is a function of small RNAs in bacterial transcriptional regulation?

Accepted Answer

They can regulate gene expression post-transcriptionally by base-pairing with mRNAs

Question 20

Which of the following best describes vertical gene transfer in bacteria?

Accepted Answer

Transfer of genetic material from mother cell to daughter cell during cell division

Transcriptional Regulation and Genetic Adaptability in Bacteria

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