Question 1

Which of the following best describes the monomer and the type of bond found in proteins?

Accepted Answer

Monomer: amino acid; Bond: peptide

Question 2

A patient is infected with a pathogen that has an $$ID_{50} of 10 $$particles. Another pathogen has an $$ID_{50} of 10$$,000 particles. Which statement is correct regarding their relative virulence?

Accepted Answer

The pathogen with $$ID_{50} of 10 is $$more virulent because fewer particles are needed to infect 50% of hosts.

Question 3

Which process allows a cell to specifically take up molecules after a ligand binds to a cell surface receptor?

Accepted Answer

Receptor-mediated endocytosis

Question 4

Which cell structure do many pathogens hijack to facilitate host cell invasion and intracellular movement?

Accepted Answer

Cytoskeleton

Question 5

A respiratory infection is cleared from the airways by the mucociliary escalator. Which host cell structure is primarily responsible for this defense?

Accepted Answer

Cilia

Question 6

Which of the following is NOT a major target of antibiotics?

Accepted Answer

Bacterial mitochondria

Question 7

A patient is prescribed sulfamethoxazole and trimethoprim for a urinary tract infection. These drugs work together by:

Accepted Answer

Blocking folate synthesis at sequential steps in the pathway

Question 8

Which mechanism of antibiotic resistance involves pumping the drug out of the bacterial cell?

Accepted Answer

Efflux pumping

Question 9

A virus uses nuclear pores to move its DNA into the host cell nucleus. What is the primary reason for this strategy?

Accepted Answer

To enable latent infection by integrating viral DNA into host genome

Question 10

Which of the following best describes the difference between a sterilant and a disinfectant?

Accepted Answer

A sterilant removes all forms of microbial life, including spores; a disinfectant reduces microbial load but may not kill spores.

Question 11

Which of the following is a passive defense mechanism used by bacteria to evade host immune responses?

Accepted Answer

Capsule

Question 12

A hospital laboratory uses the Kirby-Bauer disk diffusion method to test antibiotic susceptibility. How does the antibiotic reach the bacteria in this test?

Accepted Answer

It diffuses from the disk into the agar

Question 13

Which of the following is a correct sequence of steps in the lytic infection cycle of animal viruses?

Accepted Answer

Attachment → Penetration & Uncoating → Biosynthesis → Maturation → Release

Question 14

Which of the following is a direct damage mechanism by pathogens?

Accepted Answer

Destruction of cells/tissues at the site of infection

Question 15

Which of the following statements about Gram-positive and Gram-negative bacteria is correct regarding susceptibility to protein synthesis inhibitors?

Accepted Answer

Differences in ribosomal structure and permeability barriers can affect susceptibility to protein synthesis inhibitors.

Question 16

Which of the following is a mechanism by which bacteria can become resistant to antibiotics?

Accepted Answer

Inactivation of the antibiotic by enzymes

Question 17

Which of the following is a characteristic of an opportunistic pathogen?

Accepted Answer

It causes disease primarily in immunocompromised hosts.

Question 18

Which of the following is the correct order of biological organization from smallest to largest?

Accepted Answer

Atoms → Molecules → Cells → Tissues

Question 19

Which of the following is a correct statement about the role of the plasma membrane in infection?

Accepted Answer

It acts as the first barrier that pathogens must cross to enter the host cell.

Question 20

Which of the following is a fungal infection that affects deep tissues?

Accepted Answer

Coccidiomycosis

Microbiology for Allied Health: Review Notes and Key Concepts

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