Question 1

Which of the following best describes the difference between prokaryotic and eukaryotic genomes?

Accepted Answer

Prokaryotic genomes are usually circular, lack a nucleus, and often contain plasmids, while eukaryotic genomes are linear, found in a nucleus, and contain introns.

Question 2

A silent mutation in a gene results in:

Accepted Answer

No change in the amino acid sequence of the protein.

Question 3

Which horizontal gene transfer process in bacteria requires direct cell-to-cell contact and the presence of a pilus?

Accepted Answer

Conjugation

Question 4

In the regulation of the lac operon, what is the specific role of the repressor protein?

Accepted Answer

It binds to the operator to block RNA polymerase from transcribing the operon.

Question 5

Which of the following is an example of airborne transmission?

Accepted Answer

A person contracts tuberculosis after inhaling droplets from a cough that remain suspended in the air.

Question 6

Which stage of an infectious disease is characterized by the appearance of specific signs and symptoms?

Accepted Answer

Illness period

Question 7

A contaminated needle is used to inject medication into a patient. Which portal of entry does this scenario represent?

Accepted Answer

Parenteral route

Question 8

Which proteins play a role in the body's defense against pathogenic microbial invasion?

Accepted Answer

NOD proteins

Question 9

Which cells possess the ability to kill infected or abnormal cells without prior sensitization?

Accepted Answer

Natural killer (NK) cells

Question 10

Which of the following is a function of complement fragments in the immune response?

Accepted Answer

They damage and kill pathogenic bacteria.

Question 11

A patient’s CBC panel shows an abnormally high neutrophil count. Which condition could this indicate?

Accepted Answer

Bacterial infection

Question 12

Which antibody is most abundant in the blood and provides long-term protection?

Accepted Answer

IgG

Question 13

Which process involves coating a pathogen, frequently by complement, to make it more attractive to phagocytic cells?

Accepted Answer

Opsonization

Question 14

Which of the following is FALSE regarding B cell receptors (BCRs)?

Accepted Answer

BCRs are found on the surface of T cells.

Question 15

Which type of vaccine is prepared by inactivating a pathogen so that it stimulates an immune response but no longer causes disease?

Accepted Answer

Inactivated (killed) vaccine

Question 16

A scenario describes a person receiving antibodies from another individual to treat a disease. What type of immunity is this?

Accepted Answer

Passive immunotherapy

Question 17

Which of the following statements regarding antigens is FALSE?

Accepted Answer

They have few antigenic determinants.

Question 18

Which of the following best describes the perforin-granzyme cytotoxic pathway?

Accepted Answer

It involves the release of perforin and granzyme by cytotoxic T cells to induce apoptosis in infected cells.

Question 19

Which of the following is a key attribute of adaptive immunity?

Accepted Answer

It involves memory and specificity for antigens.

Question 20

A person receives an injection of a toxoid vaccine. Which immune response is primarily stimulated?

Accepted Answer

Production of antibodies against the toxin

Microbiology Exam Study Guidance: DNA, Operons, Immunity, and Disease Transmission

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