Question 1

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

Accepted Answer

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

Question 2

During DNA replication in bacteria, which enzyme is responsible for synthesizing the new DNA strand by adding nucleotides to the growing chain?

Accepted Answer

DNA polymerase

Question 3

A mutation occurs in the operator region of the lac operon, preventing the repressor from binding. What is the most likely outcome for the expression of the lac operon genes in the absence of lactose?

Accepted Answer

The lac operon genes will be constitutively expressed.

Question 4

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

Accepted Answer

$$DNA \rightarrow RNA \rightarrow Protein$$

Question 5

A bacterial cell is exposed to a foreign DNA fragment in its environment and incorporates it into its own genome. This process is best described as:

Accepted Answer

Transformation

Question 6

Which of the following statements about prokaryotic and eukaryotic genes is correct?

Accepted Answer

Eukaryotic genes contain introns, while prokaryotic genes generally do not.

Question 7

A patient is diagnosed with a disease that is classified as 'endemic.' Which of the following best describes this classification?

Accepted Answer

The disease is constantly present in a population at a relatively stable rate.

Question 8

Which DNA-binding protein motif is characterized by two alpha helices connected by a short loop, often involved in dimerization and DNA binding?

Accepted Answer

Helix-loop-helix

Question 9

In the tryptophan (trp) operon, what is the role of attenuation in gene regulation?

Accepted Answer

It regulates transcription termination based on tryptophan levels, providing a second layer of control.

Question 10

A bacterium acquires antibiotic resistance through a plasmid that carries both an R factor and a transfer factor. Which process most likely enabled this transfer?

Accepted Answer

Conjugation

Question 11

Which of the following best describes the function of cAMP and CAP in the regulation of the lac operon?

Accepted Answer

cAMP binds to CAP, and the complex enhances RNA polymerase binding to the promoter when glucose is low.

Question 12

A hospital experiences a sudden increase in cases of a rare bacterial infection over a short period. This pattern is best described as:

Accepted Answer

Epidemic

Question 13

Which of the following is a key difference between generalized and specialized transduction in bacteria?

Accepted Answer

Generalized transduction can transfer any bacterial gene, while specialized transduction transfers only specific genes near the prophage site.

Question 14

A patient receives a vaccine and, as a result, the spread of the disease in the community is reduced. This phenomenon is best explained by:

Accepted Answer

Herd immunity

Question 15

Which of the following is an example of a non-communicable disease?

Accepted Answer

Tetanus

Question 16

A bacterial gene is always expressed at a constant level, regardless of environmental conditions. This gene is best described as:

Accepted Answer

Constitutive

Question 17

Which of the following best describes the process of homologous recombination in bacteria?

Accepted Answer

Exchange of genetic material between two DNA molecules with similar sequences.

Question 18

A researcher is studying a bacterial infection that remains dormant in the host for years before symptoms appear. This infection is best classified as:

Accepted Answer

Latent

Question 19

Which of the following is the correct sequence for converting a DNA template strand (5'-TACGGTACG-3') into its corresponding mRNA and then into the first three amino acids using a codon table?

Accepted Answer

mRNA: 5'-AUGCCAUGC-3'; Amino acids: Met-Pro-Cys

Question 20

Which of the following best describes the role of Type 4 pili in bacterial transformation?

Accepted Answer

They mediate the uptake of extracellular DNA during transformation.

Bacterial Genetics and Principles of Disease: Study Notes

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