Q: According to the central dogma of molecular biology, what is the correct flow of genetic information in a cell?

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

Q: Which of the following is an example of a missense mutation?

A mutation that changes a codon from $$ \text{GAA} ($$glutamic acid) to $$ \text{GUA} ($$valine)

Question 1

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

Accepted Answer

Genotype is the set of genes an organism carries, while phenotype is the physical expression of those genes.

Question 2

Which of the following statements about the structure of DNA and RNA is correct?

Accepted Answer

DNA is typically double-stranded and contains thymine, while RNA is usually single-stranded and contains uracil.

Question 3

According to the central dogma of molecular biology, what is the correct flow of genetic information in a cell?

Accepted Answer

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

Question 4

During which stage of protein synthesis does mRNA splicing occur in eukaryotic cells?

Accepted Answer

During transcription, before the mRNA leaves the nucleus.

Question 5

Which of the following is NOT a post-translational modification?

Accepted Answer

Splicing

Question 6

Which of the following best explains why the genetic code is considered redundant?

Accepted Answer

Multiple codons can code for the same amino acid.

Question 7

A scientist exposes bacteria to UV light, resulting in the formation of thymine dimers. This is an example of which type of mutation?

Accepted Answer

Induced mutation

Question 8

Which of the following best describes generalized transduction in bacteria?

Accepted Answer

Transfer of any bacterial gene by a lytic phage during the assembly of new phage particles.

Question 9

Which of the following is a key difference between vertical and horizontal gene transfer?

Accepted Answer

Vertical gene transfer is the transmission of genetic material from parent to offspring, while horizontal gene transfer involves the movement of genetic material between unrelated organisms.

Question 10

A bacterial cell incorporates a piece of naked DNA from its environment and expresses a new trait. This process is best described as:

Accepted Answer

Transformation

Question 11

Which of the following best describes the function of the Ames test?

Accepted Answer

To assess the mutagenic potential of chemical compounds.

Question 12

Which of the following is an example of a missense mutation?

Accepted Answer

A mutation that changes a codon from $$ 	ext{GAA}  ($$glutamic acid) to $$ 	ext{GUA}  ($$valine)

Question 13

Which of the following mechanisms is NOT a method by which bacteria generate genetic variation?

Accepted Answer

Binary fission

Question 14

Which of the following best describes the role of transposons in genetic diversity?

Accepted Answer

Transposons are mobile genetic elements that can move within and between genomes, creating mutations and increasing genetic diversity.

Question 15

A researcher observes that a bacterial gene is only expressed when tryptophan is absent from the growth medium. This is an example of:

Accepted Answer

Repressible operon regulation

Question 16

Which of the following best describes a silent mutation?

Accepted Answer

A mutation that does not change the amino acid sequence due to the redundancy of the genetic code.

Question 17

Which of the following is a real-world example of horizontal gene transfer contributing to antibiotic resistance?

Accepted Answer

A bacterium acquires a resistance gene from a plasmid transferred by conjugation.

Question 18

Which of the following best describes specialized transduction?

Accepted Answer

A phage transfers only specific bacterial genes located near the prophage integration site.

Question 19

Which of the following is a key feature of the eukaryotic genome compared to the prokaryotic genome?

Accepted Answer

Eukaryotic genomes are linear and contained within a membrane-bound nucleus.

Question 20

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

Accepted Answer

mRNA carries the genetic code from DNA to the ribosome for translation into protein.

Genetics and Molecular Biology: Key Concepts and Mechanisms

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