Question 1

Which of the following best describes the central dogma of molecular biology?

Accepted Answer

Genetic information flows from DNA to RNA to protein.

Question 2

A mutation occurs in the gene encoding DNA polymerase, resulting in a loss of proofreading activity. What is the most likely consequence for the cell?

Accepted Answer

Increased frequency of mutations during DNA replication.

Question 3

Which of the following statements about bacterial chromosomes is correct?

Accepted Answer

Bacterial chromosomes are usually circular and supercoiled.

Question 4

During translation, which molecule carries the anticodon that base-pairs with the codon on mRNA?

Accepted Answer

Transfer RNA (tRNA)

Question 5

Which enzyme is responsible for joining Okazaki fragments on the lagging strand during DNA replication?

Accepted Answer

DNA ligase

Question 6

A scientist is sequencing the genome of a newly discovered bacterium. Which term best describes the complete genetic information of this organism?

Accepted Answer

Genome

Question 7

In E. coli, the chromosome contains approximately 4.6 million base pairs. If a mutation causes the loss of short tandem repeats (STRs), which of the following is most likely affected?

Accepted Answer

Noncoding DNA sequences

Question 8

Which process describes the flow of genetic information from one generation to the next in bacteria?

Accepted Answer

Vertical gene transfer

Question 9

Which of the following is NOT a characteristic of RNA compared to DNA?

Accepted Answer

Is double-stranded

Question 10

If a mutation changes the DNA sequence from $$\mathrm{ATG} to$$ $$\mathrm{ATA}$$, what type of mutation has occurred?

Accepted Answer

Base substitution (point mutation)

Question 11

Which of the following best explains why bacterial DNA replication is considered bidirectional?

Accepted Answer

Replication proceeds in two opposite directions from the origin.

Question 12

During transcription, which enzyme synthesizes RNA from a DNA template?

Accepted Answer

RNA polymerase

Question 13

Which of the following is a function of ribosomal RNA (rRNA) in protein synthesis?

Accepted Answer

Forms the structural and catalytic core of ribosomes

Question 14

A bacterial cell is observed to begin translation before transcription is complete. What does this indicate about the cell?

Accepted Answer

It is a prokaryotic cell.

Question 15

Which of the following best describes a gene?

Accepted Answer

A segment of DNA that encodes functional products, usually proteins

Question 16

Which of the following is the correct sequence of events in the flow of genetic information according to the central dogma?

Accepted Answer

DNA $$\rightarrow$$ RNA $$\rightarrow$$ Protein

Question 17

Which of the following statements about genotype and phenotype is correct?

Accepted Answer

Genotype is the genetic makeup, while phenotype is the expression of genes.

Question 18

A mutation in the gene encoding ribosomal RNA (rRNA) could most directly affect which cellular process?

Accepted Answer

Protein synthesis

Question 19

Which of the following is true regarding messenger RNA (mRNA)?

Accepted Answer

It carries coded information from DNA to ribosomes.

Question 20

If a bacterial cell receives a mutation that prevents the formation of peptide bonds, which process will be directly affected?

Accepted Answer

Translation

Microbial Genetics: Structure and Function of Genetic Material

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