Q: Which of the following is a correct representation of the central dogma of genetics?

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

Question 1

Which of the following statements best describes the difference between genotype and phenotype in a microorganism?

Accepted Answer

Genotype is the complete collection of genes and nucleotide sequences, while phenotype is the manifestation of those genes as physical and functional traits.

Question 2

Which component is NOT part of a nucleotide in nucleic acids?

Accepted Answer

Amino acid

Question 3

Prokaryotic cells are described as haploid. What does this mean?

Accepted Answer

They have a single copy of each chromosome.

Question 4

Which type of plasmid would most likely be found in a bacterial cell that can survive antibiotic treatment?

Accepted Answer

Resistance plasmid

Question 5

Eukaryotic chromosomes differ from prokaryotic chromosomes in which of the following ways?

Accepted Answer

Eukaryotic chromosomes are linear and sequestered within the nucleus.

Question 6

During DNA replication, which direction does DNA polymerase synthesize the new strand?

Accepted Answer

5' to 3'

Question 7

Which statement best explains why DNA replication is described as 'semiconservative'?

Accepted Answer

Each new DNA molecule contains one original strand and one newly synthesized strand.

Question 8

In prokaryotic DNA replication, what is the main difference between synthesis of the leading and lagging strands?

Accepted Answer

The leading strand is synthesized continuously, while the lagging strand is synthesized discontinuously.

Question 9

Which of the following is a correct representation of the central dogma of genetics?

Accepted Answer

$$	ext{DNA} ightarrow 	ext{RNA} ightarrow 	ext{Polypeptide}$$

Question 10

Which process involves the synthesis of polypeptides from mRNA by ribosomes?

Accepted Answer

Translation

Question 11

A mutation that changes a codon but does NOT alter the amino acid sequence of the resulting protein is called:

Accepted Answer

Silent mutation

Question 12

Which type of horizontal gene transfer in bacteria requires a virus to mediate the transfer of DNA?

Accepted Answer

Transduction

Question 13

A bacterial cell that receives an R-factor plasmid through conjugation is most likely to:

Accepted Answer

Become resistant to multiple antibiotics

Question 14

Which of the following best describes the function of transposons?

Accepted Answer

They move segments of DNA from one location to another within the genome.

Question 15

Which repair mechanism is considered a 'last resort' when DNA damage is extensive?

Accepted Answer

Error-prone repair (SOS response)

Question 16

A mutation caused by the insertion or deletion of a nucleotide pair, resulting in a shift of the reading frame, is called:

Accepted Answer

Frameshift mutation

Question 17

Which of the following is a real-world example of an inducible operon in bacteria?

Accepted Answer

lac operon

Question 18

Which of the following statements about the lac operon is TRUE?

Accepted Answer

It is activated by the presence of lactose and cAMP-CAP complex.

Question 19

Which type of mutation is most likely to result from exposure to ultraviolet light?

Accepted Answer

Thymine dimer formation

Question 20

A scientist is studying a bacterial strain that can take up naked DNA from its environment. Which process is she investigating?

Accepted Answer

Transformation

Microbial Genetics: Structure and Replication of Genomes

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