Question 1

Which of the following is a key structural difference between Gram-positive and Gram-negative bacterial cell envelopes?

Accepted Answer

Gram-positive bacteria have a thick peptidoglycan layer and lack an outer membrane.

Question 2

Which of the following best explains why prokaryotes are generally so small?

Accepted Answer

Their surface area-to-volume ratio must remain high to allow efficient nutrient uptake and waste removal.

Question 3

A bacterium is placed in a hypertonic solution. What is the most likely outcome for the cell?

Accepted Answer

Water will leave the cell, causing plasmolysis.

Question 4

Which of the following statements about bacterial endospores is correct?

Accepted Answer

Endospores are highly resistant dormant structures that can survive extreme conditions.

Question 5

Which of the following best describes the function of thylakoids in prokaryotic cells?

Accepted Answer

They are sites of photosynthetic light reactions.

Question 6

A scientist stains two bacterial samples: one stains purple and the other stains pink after Gram staining. What is the most likely explanation?

Accepted Answer

The purple-stained bacteria are Gram-positive, and the pink-stained bacteria are Gram-negative.

Question 7

Which of the following is a function of bacterial flagella?

Accepted Answer

Motility through rotation powered by a proton gradient

Question 8

Which of the following best describes the nucleoid region in a prokaryotic cell?

Accepted Answer

It is a region where circular DNA is located, not separated by a membrane.

Question 9

Which of the following best explains why antibiotics that target peptidoglycan synthesis are generally effective against bacteria but not human cells?

Accepted Answer

Bacteria have peptidoglycan in their cell walls, which human cells lack.

Question 10

A patient is infected with Bacillus anthracis, a bacterium known to form endospores. Which property of endospores makes this infection particularly difficult to eradicate?

Accepted Answer

Endospores are resistant to heat, desiccation, and many disinfectants.

Question 11

Which of the following is an example of passive transport in prokaryotic cells?

Accepted Answer

Facilitated diffusion of ions through a channel protein.

Question 12

Which of the following best describes the function of storage granules in prokaryotic cells?

Accepted Answer

They store nutrients such as glycogen or polyphosphate for later use.

Question 13

Which of the following statements about the differences between Bacteria and Archaea is correct?

Accepted Answer

Archaea have ether-linked membrane lipids, while Bacteria have ester-linked lipids.

Question 14

A bacterial cell is placed in a hypotonic solution. What is the most likely outcome?

Accepted Answer

Water will enter the cell, but the cell wall prevents lysis.

Question 15

Which of the following best explains how periplasmic flagella benefit spirochetes?

Accepted Answer

They enable corkscrew motility, allowing movement through viscous environments.

Question 16

Which of the following is a correct statement about the coordination of DNA replication and cell division in prokaryotes?

Accepted Answer

DNA replication begins at a single origin and is coordinated with cell division to ensure each daughter cell receives a copy.

Question 17

Which of the following best explains why antibiotics that target bacterial ribosomes are generally not toxic to human cells?

Accepted Answer

Bacterial ribosomes are structurally different from eukaryotic ribosomes, allowing selective targeting.

Question 18

Which of the following is NOT a function of the bacterial cell envelope?

Accepted Answer

Protein synthesis

Question 19

Which of the following is a medically important endospore-forming bacterium that can cause disease in humans?

Accepted Answer

Clostridium botulinum

Question 20

Which of the following best describes the effect of detergents on Gram-negative bacteria?

Accepted Answer

Detergents disrupt the outer membrane, increasing susceptibility to antibiotics.

Fundamental Concepts in Prokaryotic Microbiology: Structure, Function, and Clinical Relevance

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