Question 1

Which of the following best describes the relationship between genotype and phenotype in a cell?

Accepted Answer

Genotype directly determines phenotype by encoding proteins that result in observable traits.

Question 2

Which of the following statements about prokaryotic and eukaryotic genomes is CORRECT?

Accepted Answer

Prokaryotic genomes are typically circular and may include plasmids, while eukaryotic genomes are linear and found in the nucleus.

Question 3

Which of the following is a difference between DNA and RNA?

Accepted Answer

DNA is usually double-stranded, while RNA is usually single-stranded.

Question 4

During DNA replication, which enzyme is responsible for unwinding the DNA double helix?

Accepted Answer

Helicase

Question 5

What is the function of DNA polymerase III during DNA replication?

Accepted Answer

It synthesizes new DNA strands by adding nucleotides to the RNA primer.

Question 6

Which of the following best explains why DNA replication is described as 'semiconservative'?

Accepted Answer

Each new DNA molecule consists of one parent strand and one newly synthesized strand.

Question 7

Which of the following is TRUE regarding the directionality of nucleic acid synthesis?

Accepted Answer

Both DNA and RNA are synthesized in the 5' to 3' direction.

Question 8

A mutation changes a DNA codon from TTT to ATT. What is the most likely effect on the resulting protein?

Accepted Answer

A nonsense mutation; a stop codon is introduced, terminating the protein early.

Question 9

Which process allows bacteria to acquire new genetic material from their environment without cell division?

Accepted Answer

Transformation

Question 10

Which of the following best describes the role of tRNA during translation?

Accepted Answer

It brings specific amino acids to the ribosome based on the codon sequence of mRNA.

Question 11

Which of the following is a function of the enzyme ligase during DNA replication?

Accepted Answer

It forms phosphodiester bonds to seal nicks in the DNA backbone.

Question 12

Which of the following is an example of horizontal gene transfer in bacteria?

Accepted Answer

A bacterium acquiring a plasmid through conjugation.

Question 13

Which of the following mutations is most likely to result in a frameshift?

Accepted Answer

Insertion or deletion of one or two nucleotides

Question 14

Which of the following statements about plasmids is TRUE?

Accepted Answer

Plasmids are small, circular DNA molecules that can replicate independently of chromosomal DNA.

Question 15

Which enzyme is responsible for replacing RNA primers with DNA during DNA replication?

Accepted Answer

DNA polymerase I

Question 16

A scientist observes that a bacterial cell can now survive in the presence of an antibiotic after being exposed to a bacteriophage. Which genetic process most likely occurred?

Accepted Answer

Transduction

Question 17

Which of the following best describes the function of mRNA in protein synthesis?

Accepted Answer

It carries the genetic code from DNA to the ribosome for translation.

Question 18

Which of the following is a property of the genetic code?

Accepted Answer

There are three stop codons that signal the end of translation.

Question 19

Which of the following is a key difference between transcription in prokaryotes and eukaryotes?

Accepted Answer

Eukaryotic mRNA must be spliced and exported from the nucleus before translation.

Question 20

Which of the following best describes the role of reverse transcriptase?

Accepted Answer

It synthesizes DNA from an RNA template.

Chapter 5: Microbial Genetics – Structure, Function, and Expression

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