Question 1

Which bacterial species is most commonly associated with skin and soft tissue infections, and is a frequent cause of hospital-acquired infections?

Accepted Answer

Staphylococcus aureus

Question 2

A patient is diagnosed with MRSA. What is the best infection control measure to prevent its spread in a hospital setting?

Accepted Answer

Hand hygiene and contact precautions

Question 3

Which vaccine prevents Streptococcus pneumoniae infections, especially in high-risk populations?

Accepted Answer

Pneumococcal conjugate vaccine (PCV)

Question 4

A patient with a history of antibiotic use develops severe diarrhea and is diagnosed with Clostridium difficile infection. What is the required infection control for this pathogen?

Accepted Answer

Contact precautions and handwashing with soap and water

Question 5

Mycobacterium tuberculosis primarily spreads via which route?

Accepted Answer

Airborne droplet nuclei

Question 6

Which toxin produced by Clostridium tetani interferes with neurotransmitter release, causing muscle rigidity?

Accepted Answer

Tetanospasmin

Question 7

Gram-negative bacteria appear ________ after Gram staining.

Accepted Answer

Pink/red

Question 8

Which structure provides bacteria with shape and support, and is the main component of the bacterial cell wall?

Accepted Answer

Peptidoglycan

Question 9

During binary fission, bacteria replicate their DNA and divide. Which process requires ATP to move substances against a gradient?

Accepted Answer

Active transport

Question 10

Which of the following statements about plasmids is correct?

Accepted Answer

Plasmids carry genetic information that can confer antibiotic resistance

Question 11

Which enzyme is responsible for synthesizing new DNA strands during replication?

Accepted Answer

DNA polymerase

Question 12

A point mutation in DNA is defined as a change in:

Accepted Answer

A single nucleotide

Question 13

Which process produces the most ATP in bacterial cells?

Accepted Answer

Aerobic respiration

Question 14

The electron transport chain (ETC) occurs in the ________ of bacteria.

Accepted Answer

Cell membrane

Question 15

Which antibiotic is more effective against Gram-positive bacteria due to its mechanism of action on the cell wall?

Accepted Answer

Penicillin

Question 16

Which bacterium is the causative agent of tuberculosis?

Accepted Answer

Mycobacterium tuberculosis

Question 17

Viruses contain genetic material in the form of:

Accepted Answer

Either DNA or RNA

Question 18

Oncogenic viruses can cause cancer by:

Accepted Answer

Integrating their DNA into host cell genome

Question 19

Which scientist disproved the theory of spontaneous generation by demonstrating that microorganisms arise from other microorganisms?

Accepted Answer

Louis Pasteur

Question 20

Which structure in bacteria is responsible for motility and is powered by a rotary motor?

Accepted Answer

Flagella

Comprehensive Microbiology Final Review Study Guide

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