Question 1

Which of the following best describes the difference between innate and adaptive immunity?

Accepted Answer

Innate immunity is non-specific, present at birth, and responds rapidly, while adaptive immunity is specific, develops after exposure, and has memory.

Question 2

A patient presents with recurrent infections and is diagnosed with DiGeorge Syndrome. Which immune component is most affected in this condition?

Accepted Answer

T cell function due to impaired thymus development

Question 3

Which of the following is a mechanical barrier that helps prevent pathogen entry?

Accepted Answer

Cilia moving mucus in the respiratory tract

Question 4

Which white blood cell is primarily responsible for rapid response and phagocytosis of bacteria?

Accepted Answer

Neutrophils

Question 5

Which molecular defense mechanism limits bacterial growth by reducing the availability of free iron?

Accepted Answer

Iron-binding proteins such as transferrin and lactoferrin

Question 6

During inflammation, which chemical mediator is primarily responsible for vasodilation and increased vascular permeability?

Accepted Answer

Histamine

Question 7

A patient with HIV is at increased risk for opportunistic infections. Which cell type is most directly targeted and depleted by HIV?

Accepted Answer

Helper T cells (CD4+)

Question 8

Which step in the HIV replication cycle involves the conversion of single-stranded RNA to double-stranded DNA, and which enzyme is responsible?

Accepted Answer

Reverse transcription; reverse transcriptase

Question 9

Which of the following is an AIDS-defining illness caused by a fungus?

Accepted Answer

Pneumocystis Pneumonia (PCP)

Question 10

Which antimicrobial drug class inhibits cell wall synthesis and is associated with the side effect known as 'Red man syndrome'?

Accepted Answer

Glycopeptides (e.g., Vancomycin)

Question 11

A patient treated with aminoglycosides develops hearing loss and kidney damage. Which ribosomal subunit is targeted by this drug class?

Accepted Answer

30S

Question 12

Which equation best represents the relationship between the rate of bacterial growth and the availability of iron, considering iron-binding proteins?

Accepted Answer

$$r = k \cdot [Fe]$$

Question 13

Which drug is most likely to cause tendon rupture, especially in elderly patients, and what is its mechanism of action?

Accepted Answer

Ciprofloxacin; inhibits DNA replication

Question 14

Which of the following best explains why penicillins are considered bactericidal?

Accepted Answer

They disrupt cell wall synthesis, leading to cell lysis and death.

Question 15

A patient with a history of antibiotic use develops a C. difficile infection after clindamycin therapy. Which ribosomal subunit does clindamycin target?

Accepted Answer

50S

Question 16

Which of the following is a major mechanism of antibiotic resistance in bacteria, and which equation describes the rate of drug inactivation?

Accepted Answer

Drug inactivation by enzymes; $$r = k \cdot [Enzyme] \cdot [Drug]$$

Question 17

Which antifungal drug class binds ergosterol in fungal cell membranes, and what is a major toxicity associated with this class?

Accepted Answer

Polyenes; kidney toxicity

Question 18

A child treated with tetracycline develops yellow discoloration of teeth. What is the mechanism of action of tetracyclines?

Accepted Answer

Inhibit protein synthesis by binding to the 30S ribosomal subunit

Question 19

Which equation best describes the effect of complement proteins on cell lysis, assuming complement concentration $$[C]$$ and target cell concentration $$[T]$$?

Accepted Answer

$$r = k \cdot [C] \cdot [T]$$

Question 20

Which of the following is a systemic autoimmune disorder characterized by joint pain, rash, and fatigue?

Accepted Answer

Lupus

Innate and Adaptive Immunity, Immunodeficiencies, HIV, and Antimicrobial Drugs: Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards