BIOD 171 Essential Microbiology – 100 Exam Questions with Answers | Complete Study Guide

100

,Microbiology Exam Questions with Answers

create the 100 questions and answers well structured and well used right tick to mark correct
answer BIOD 171 Essential Microbiology Module 5 Exam Questions & Answers (Latest
2025/2026)

Here is a well-structured set of 100 Q&A for Microbiology, modeled after a Module 5 exam
format, using checkmarks (✓) to denote correct answers. The questions cover common topics in
applied microbiology, including epidemiology, immunology, and public health.

BIOD 171 Essential Microbiology - Module 5 Exam (Applied Microbiology & Epidemiology)

1. What is the primary focus of epidemiology?

• A) Studying individual patient symptoms

• B) Analyzing the spread and control of diseases in populations ✓

• C) Developing new antibiotics in the lab

• D) Sequencing microbial genomes

2. Which term describes a disease that is constantly present at a low level in a population?

• A) Epidemic

• B) Pandemic

• C) Endemic ✓

• D) Sporadic

3. What is the basic reproduction number (R₀)?

• A) The total number of cases in an outbreak

• B) The average number of secondary cases from one infected individual in a susceptible
population ✓

• C) The mortality rate of a disease

• D) The number of vaccine doses needed for herd immunity

4. Which is NOT a common portal of entry for pathogens?

• A) Mucous membranes

• B) Skin

, • C) Parenteral route

• D) Intact hair follicles ✓

5. What type of infection is caused by a pathogen that takes advantage of a weakened host
immune system?

• A) Primary infection

• B) Opportunistic infection ✓

• C) Acute infection

• D) Subclinical infection

6. What does "herd immunity" refer to?

• A) Immunity in livestock populations

• B) When a high percentage of a population is immune, protecting those who are not ✓

• C) The natural immunity of a population over time

• D) Immunity provided by broad-spectrum antibiotics

7. Which term describes a healthcare-associated infection (HAI)?

• A) Community-acquired

• B) Nosocomial infection ✓

• C) Zoonotic infection

• D) Vector-borne infection

8. What is a fomite?

• A) An insect vector

• B) An inanimate object that can harbor pathogens and spread infection ✓

• C) A type of white blood cell

• D) A bacterial toxin

9. What is the role of a reservoir in the chain of infection?

• A) The location where a pathogen exits the host

• B) The place where the pathogen lives and multiplies ✓

, • C) The mode of transportation for the pathogen

• D) The portal of entry into a new host

10. Which is an example of direct contact transmission?

• A) Inhaling contaminated air droplets

• B) Shaking hands with an infected person ✓

• C) Drinking contaminated water

• D) Being bitten by a mosquito

11. What type of microorganism causes Malaria?

• A) Bacterium

• B) Virus

• C) Protozoan ✓

• D) Fungus

12. Which virus is known for causing a "slapped cheek" rash in children?

• A) Varicella-zoster virus

• B) Parvovirus B19 ✓

• C) Measles virus

• D) Rubella virus

13. What is the causative agent of Tuberculosis?

• A) Streptococcus pneumoniae

• B) Mycobacterium tuberculosis ✓

• C) Escherichia coli

• D) Staphylococcus aureus

14. The DTaP vaccine protects against which of the following?

• A) Diptheria, Tetanus, Pertussis ✓

• B) Dengue, Typhoid, Polio

• C) Diphtheria, Typhus, Plague