Question 1

Which of the following best describes the difference between sterilization and disinfection in microbial control?

Accepted Answer

Sterilization removes all forms of microbial life, including spores, while disinfection only reduces the number of pathogenic organisms but may not eliminate spores.

Question 2

Which method of microbial control is most appropriate for sterilizing heat-sensitive medical equipment?

Accepted Answer

Filtration

Question 3

A hospital needs to sterilize surgical instruments quickly. Which form of dry heat would be most effective?

Accepted Answer

Hot air oven at $$170\ ^\circ \mathrm{C}$$ for 2 hours

Question 4

Which preservation method works by removing water from microbial cells, thereby inhibiting their growth?

Accepted Answer

Desiccation

Question 5

How does filtration control microbial growth in liquid solutions?

Accepted Answer

By physically removing microbes based on size exclusion through a membrane

Question 6

Which chemical agent is classified as an oxidizing agent and is commonly used for disinfecting surfaces?

Accepted Answer

Hydrogen peroxide ($$\mathrm{H}_2\mathrm{O}_2)$$

Question 7

What is the main difference between an antimicrobial and an antibiotic?

Accepted Answer

Antibiotics are produced by microorganisms and specifically target bacteria, while antimicrobials can be synthetic or natural and target a broader range of microbes.

Question 8

Which scientist is credited with discovering penicillin, the first true antibiotic?

Accepted Answer

Alexander Fleming

Question 9

A patient is infected with MRSA (Methicillin-resistant Staphylococcus aureus). Which antibiotic is usually given to treat this infection?

Accepted Answer

Vancomycin

Question 10

Which metabolic pathway do sulfonamide drugs block in bacteria, and why do these drugs not harm humans?

Accepted Answer

Sulfonamides inhibit folic acid synthesis, which bacteria must perform themselves, while humans obtain folic acid from their diet.

Question 11

Which of the following is a major disadvantage of taking chloramphenicol?

Accepted Answer

It can cause aplastic anemia by suppressing bone marrow function.

Question 12

What is the main mechanism by which giving antibiotics leads to the development of resistance in bacterial populations?

Accepted Answer

Antibiotics select for resistant bacteria, allowing them to survive and multiply while sensitive bacteria are killed.

Question 13

Which of the following best describes herd immunity?

Accepted Answer

When a sufficient proportion of a population is immune to an infectious disease, its spread is limited, protecting even those who are not immune.

Question 14

Which type of vaccine contains a weakened form of the pathogen that can replicate but does not cause disease?

Accepted Answer

Live attenuated vaccine

Question 15

Which antibody is most abundant in human serum and is responsible for long-term immunity?

Accepted Answer

IgG

Question 16

A patient receives an injection of pre-formed antibodies after exposure to rabies. What type of immunity is this?

Accepted Answer

Artificial passive immunity

Question 17

Which line of defense involves B cells and T cells, and what is their main role?

Accepted Answer

Third line of defense; they provide adaptive immunity by recognizing and responding to specific antigens.

Question 18

Which antibiotic works by inhibiting bacterial cell wall synthesis?

Accepted Answer

Penicillin

Question 19

Which of the following is a major disadvantage of taking tetracycline?

Accepted Answer

It can cause permanent discoloration of teeth in children.

Microbial Control, Antibiotics, and Immunity: Study Guide

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