Question 1

Which structure is responsible for bacterial motility and can be used to distinguish between different types of bacteria based on their arrangement and number?

Accepted Answer

Flagella

Question 2

A Gram stain is performed on a bacterial sample. The cells appear purple under the microscope. What does this indicate about the cell wall structure?

Accepted Answer

The bacteria have a thick peptidoglycan layer and no outer membrane.

Question 3

Which genus of bacteria is known for producing endospores and causing diseases such as anthrax and botulism?

Accepted Answer

Bacillus

Question 4

Methanogens, halophiles, and thermophiles are all types of which domain of life, and what makes them unique?

Accepted Answer

Archaea; they thrive in extreme environments and have unique membrane lipids.

Question 5

Which of the following protists is responsible for causing malaria, and what is its primary vector?

Accepted Answer

Plasmodium; transmitted by Anopheles mosquitoes

Question 6

What is the main difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have a nucleus and membrane-bound organelles.

Question 7

Which structure in fungi is responsible for nutrient absorption and forms the main body of the fungus?

Accepted Answer

Hyphae

Question 8

A patient presents with symptoms of tapeworm infection. Which organism is most likely responsible, and how is it typically transmitted?

Accepted Answer

Taenia; ingestion of undercooked meat

Question 9

Which of the following is a defining feature of enveloped viruses?

Accepted Answer

They possess a lipid bilayer derived from the host cell membrane.

Question 10

During the lysogenic cycle, what happens to the viral genome?

Accepted Answer

It integrates into the host genome and remains dormant.

Question 11

Which equation best represents the exponential growth of bacteria under ideal conditions?

Accepted Answer

$$N_t = N_0$ 	imes 2^n$$

Question 12

Which virus is classified as a retrovirus and is known for causing AIDS?

Accepted Answer

HIV

Question 13

What is the primary function of bacterial pili?

Accepted Answer

Attachment to surfaces and conjugation

Question 14

Which term describes a disease that spreads rapidly and affects a large number of people across several countries or continents?

Accepted Answer

Pandemic

Question 15

Which bacterial genus is commonly found in the human gut and is beneficial for digestion, but can also cause infections if displaced?

Accepted Answer

Bacteroides

Question 16

Which of the following is NOT a step in the lytic cycle of viral infection?

Accepted Answer

Integration into host genome

Question 17

Which equation describes the rate of fungal spore production if a fungus produces $$r$$ spores per hour for $$t$$ hours?

Accepted Answer

$$S = r 	imes t$$

Question 18

Which protist is known for causing severe diarrhea and is often contracted from contaminated water?

Accepted Answer

Giardia

Question 19

Which term refers to an organism that transmits a pathogen from one host to another?

Accepted Answer

Vector

Question 20

Which of the following is a DNA virus that has been eradicated globally through vaccination?

Accepted Answer

Smallpox

Microbiology Chapters 11–13: Prokaryotes, Eukaryotes, and Viruses Study Guide

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