Question 1

Which of the following best describes the role of normal microflora in the human body?

Accepted Answer

They live in or on the body and benefit us by microbial antagonism.

Question 2

A patient presents with pain and burning during urination, frequent urination, and confusion. Which of the following is the most likely diagnosis?

Accepted Answer

Cystitis

Question 3

Which of the following is a major virulence factor that allows bacteria to attach to host tissues?

Accepted Answer

Pili or capsule

Question 4

What is the function of hyaluronidase in bacterial invasiveness?

Accepted Answer

It digests hyaluronic acid, allowing bacteria to invade deeper tissues.

Question 5

A throat swab is plated on blood agar and shows clear zones around colonies. What type of hemolysis is indicated, and which organism is most likely responsible?

Accepted Answer

Beta-hemolysis; Streptococcus pyogenes

Question 6

Which of the following best explains why antibiotics are not effective in treating botulism?

Accepted Answer

The neurotoxin is already present and causing symptoms before bacteria are killed.

Question 7

A patient is diagnosed with tetanus after a puncture wound. Which of the following is the most appropriate immediate treatment?

Accepted Answer

Administering antitoxin and maintaining respiration

Question 8

Which of the following is a characteristic of endotoxins?

Accepted Answer

They are released when the bacterial cell dies.

Question 9

A 3-year-old child is hospitalized with 'floppy baby syndrome' after consuming honey. What is the most likely cause?

Accepted Answer

Clostridium botulinum toxin production in the gut

Question 10

Which of the following best describes the transmission of West Nile virus to humans?

Accepted Answer

Mosquito vector from infected birds

Question 11

A patient with a sore throat, fever, and swollen tonsils is found to have beta-hemolytic colonies on blood agar. What is the most likely complication if left untreated?

Accepted Answer

Rheumatic fever due to cross-reacting antibodies

Question 12

Which of the following is the best method to prevent foodborne botulism?

Accepted Answer

Proper canning and boiling home-canned food for 20 minutes

Question 13

Which of the following is a portal of entry for pathogens that is specific to females?

Accepted Answer

Vagina

Question 14

Which of the following best explains why urine in the bladder is normally sterile?

Accepted Answer

Urine is a good growth medium, but the bladder is a closed system.

Question 15

A laboratory test shows partial lysis of red blood cells with a greenish zone on blood agar. What type of hemolysis is this?

Accepted Answer

Alpha-hemolysis

Question 16

Which of the following is a common reservoir for Escherichia coli causing urinary tract infections?

Accepted Answer

Self (endogenous flora)

Question 17

A patient with a history of poor hygiene and incomplete bladder emptying is at increased risk for which type of infection?

Accepted Answer

Urinary tract infection

Question 18

Which of the following best describes the action of coagulase as a bacterial virulence factor?

Accepted Answer

It clots blood to protect bacteria from immune cells.

Question 19

Which of the following is the most effective way to diagnose West Nile virus infection?

Accepted Answer

Blood test for antibodies to the virus

Question 20

A patient is found to have a clear zone around colonies on blood agar, and the organism is Gram-positive streptococci. What is the most likely diagnosis?

Accepted Answer

Streptococcus pyogenes infection

Host-Microbe Relationships and Pathogenesis: Anatomy & Physiology Study Guide

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