Question 1

Which of the following best describes the genetic material in prokaryotic cells?

Accepted Answer

It is found in a nucleoid region without a surrounding membrane.

Question 2

A microbiologist observes a bacterial sample that appears as purple rods after Gram staining. Which organism is most likely present?

Accepted Answer

Bacillus subtilis

Question 3

Which of the following structures allows bacteria to survive harsh environmental conditions by entering a dormant state?

Accepted Answer

Endospore

Question 4

Which of the following is a major chemical difference between Gram-positive and Gram-negative bacterial cell walls?

Accepted Answer

Presence of lipopolysaccharides in Gram-negative walls

Question 5

Which staining technique would you use to identify Mycobacterium tuberculosis in a clinical sample?

Accepted Answer

Acid-fast staining

Question 6

Which of the following statements about prokaryotic ribosomes is correct?

Accepted Answer

They are the target for many antibiotics.

Question 7

Which of the following best explains why Gram-negative bacteria tend to be more resistant to certain antibiotics than Gram-positive bacteria?

Accepted Answer

They have an outer membrane containing lipopolysaccharides.

Question 8

Which of the following is true regarding the cytoplasm of bacterial cells compared to eukaryotic cells?

Accepted Answer

It is similar in many respects, but still different.

Question 9

Which of the following is NOT a function of the bacterial capsule?

Accepted Answer

Protein synthesis

Question 10

Which of the following statements about fimbriae is correct?

Accepted Answer

Fimbriae are basically short pili.

Question 11

Which of the following is a distinguishing feature of Archaea compared to Bacteria?

Accepted Answer

Ability to produce methane

Question 12

A patient is diagnosed with tuberculosis. Which of the following statements about the causative agent is correct?

Accepted Answer

It is an aerobic bacillus with a waxy cell wall.

Question 13

Which of the following is the correct sequence for the Gram staining procedure?

Accepted Answer

Crystal violet, iodine, alcohol, safranin

Question 14

Which of the following is a real-world consequence of the presence of endospores in Bacillus anthracis?

Accepted Answer

It can be used as a bioterrorism agent due to its resistance to harsh conditions.

Question 15

Which of the following is used to classify bacteria?

Accepted Answer

All of these choices

Question 16

Which of the following best describes the function of the bacterial cell wall?

Accepted Answer

It provides resistance to osmotic pressure and mechanical forces.

Question 17

Which of the following is true for both Treponema and Chlamydia?

Accepted Answer

They both cause sexually transmitted diseases (STIs).

Question 18

Which of the following is a correct match between bacterial genus and morphology?

Accepted Answer

Staphylococcus = spheres in clumps

Question 19

Which of the following is a common feature of all prokaryotic cells?

Accepted Answer

Presence of a nucleoid region

Question 20

Which of the following best explains why acid-fast bacteria appear weakly purple after Gram staining?

Accepted Answer

They have waxy mycolic acids that prevent full uptake of the stain.

The Prokaryotic Cell and Microorganisms: Structure, Function, and Classification

Study Guide - Practice Questions