Q: Which of the following equations correctly represents the central dogma of molecular biology?

$$\text{DNA} \rightarrow \text{RNA} \rightarrow \text{Protein}$$

Question 1

Which of the following best describes the difference between genotype and phenotype in bacteria?

Accepted Answer

Genotype is the genetic makeup of an organism, while phenotype is the expression of those genes as observable traits.

Question 2

E. coli's chromosome is best described as:

Accepted Answer

Circular and double-stranded

Question 3

During DNA replication in bacteria, which enzyme is primarily responsible for synthesizing the new DNA strand?

Accepted Answer

DNA polymerase

Question 4

A mutation that changes a single nucleotide in a gene, resulting in a different amino acid, is called:

Accepted Answer

Missense mutation

Question 5

Which of the following is a real-world example of a mutagen that can cause mutations in bacterial DNA?

Accepted Answer

UV light from sunlight

Question 6

In the process of transcription, which molecule is synthesized from a DNA template?

Accepted Answer

mRNA

Question 7

Which of the following best describes genetic recombination in bacteria?

Accepted Answer

The exchange of genetic material between two DNA molecules, resulting in new combinations of genes

Question 8

A scientist introduces purified DNA from a pathogenic strain of Streptococcus into a non-pathogenic strain, which then becomes pathogenic. This process is an example of:

Accepted Answer

Transformation

Question 9

Which of the following statements about plasmids is correct?

Accepted Answer

Plasmids are small, circular DNA molecules that can carry genes for antibiotic resistance.

Question 10

In bacterial conjugation, which structure is used to transfer genetic material from one cell to another?

Accepted Answer

Pilus

Question 11

Transduction in bacteria involves:

Accepted Answer

Transfer of DNA by a bacteriophage

Question 12

A frameshift mutation occurs when:

Accepted Answer

A nucleotide is inserted or deleted, altering the reading frame of the gene

Question 13

Which of the following equations correctly represents the central dogma of molecular biology?

Accepted Answer

$$	ext{DNA} ightarrow 	ext{RNA} ightarrow 	ext{Protein}$$

Question 14

A bacterial cell exposed to UV light develops a mutation in its DNA. Which type of mutation is most commonly caused by UV light?

Accepted Answer

Thymine dimer formation

Question 15

Which of the following best explains why plasmids are important in medical microbiology?

Accepted Answer

They often carry genes for antibiotic resistance, which can be transferred between bacteria.

Question 16

If a bacterium acquires a gene for antibiotic resistance through transduction, which agent was most likely involved?

Accepted Answer

A bacteriophage

Question 17

Which process involves the uptake of naked DNA from the environment by a bacterial cell?

Accepted Answer

Transformation

Question 18

A mutation in a gene results in the following change: $$	ext{GAA} ightarrow 	ext{GAG}. $$Both codons code for glutamic acid. What type of mutation is this?

Accepted Answer

Silent mutation

Question 19

Which of the following is NOT a method of genetic transfer in bacteria?

Accepted Answer

Translation

Question 20

A patient is infected with a strain of E. coli that has acquired a plasmid encoding for beta-lactamase. Which of the following best explains how this gene could be transferred to another E. coli cell?

Accepted Answer

Through conjugation using a pilus

Microbial Genetics: Structure, Function, Mutation, and Genetic Transfer

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