Question 1

Which of the following statements best explains why ancient prokaryotes were able to survive on early Earth?

Accepted Answer

They lived in colonial microbial mats near hydrothermal vents, which shielded them from the harsh atmosphere.

Question 2

Which structural feature is unique to Archaea compared to Bacteria?

Accepted Answer

Cell membrane composed of a lipid monolayer

Question 3

A scientist discovers a prokaryote living in a highly acidic hot spring. Which domain is this organism most likely to belong to?

Accepted Answer

Archaea, because many are extremophiles

Question 4

Which of the following best describes the genetic material in prokaryotes?

Accepted Answer

A single circular double-stranded DNA chromosome located in the cytoplasm

Question 5

Which process allows prokaryotes to exchange genetic material by direct cell-to-cell contact?

Accepted Answer

Conjugation

Question 6

Gram-negative bacteria are characterized by which of the following cell wall features?

Accepted Answer

A thin layer of peptidoglycan surrounded by an outer membrane containing lipopolysaccharides

Question 7

Which of the following shapes is NOT a typical prokaryotic cell shape?

Accepted Answer

Cuboidal (cubes)

Question 8

Why is the development of antibiotic resistance in bacteria a major concern for public health?

Accepted Answer

It makes common bacterial infections harder to treat, potentially leading to epidemics.

Question 9

Which of the following mechanisms is responsible for the spread of antibiotic resistance genes among bacterial populations?

Accepted Answer

Genetic recombination through transformation, transduction, and conjugation

Question 10

A patient is diagnosed with pneumonia caused by Streptococcus pneumoniae. Which feature of this bacterium makes it susceptible to penicillin?

Accepted Answer

Presence of peptidoglycan in the cell wall

Question 11

Which equation best represents the exponential growth of a bacterial population through binary fission?

Accepted Answer

$N = N_0 	imes 2^n$

Question 12

Which of the following is a real-world example of an endemic disease caused by a prokaryote?

Accepted Answer

Tuberculosis

Question 13

What is the primary function of plasmids in prokaryotic cells?

Accepted Answer

They carry genes that can provide advantages, such as antibiotic resistance.

Question 14

Which of the following best explains why blue-green algae (cyanobacteria) were crucial for the evolution of life on Earth?

Accepted Answer

They oxygenated the atmosphere, enabling the evolution of aerobic organisms.

Question 15

Which of the following is NOT a method by which prokaryotes acquire genetic variation?

Accepted Answer

Binary fission

Question 16

Methicillin-resistant Staphylococcus aureus (MRSA) is a concern because:

Accepted Answer

It is resistant to most antibiotics, making infections difficult to treat.

Question 17

Which of the following best describes the role of the capsule in some prokaryotic cells?

Accepted Answer

It protects the cell from desiccation and helps evade the host immune system.

Question 18

A bacterium with an F+ factor can:

Accepted Answer

Produce pili and transfer genetic material to another bacterium via conjugation.

Question 19

Which of the following is a consequence of overprescribing antibiotics?

Accepted Answer

It selects for antibiotic-resistant bacteria, making future infections harder to treat.

Question 20

Which of the following statements about peptidoglycan is correct?

Accepted Answer

It consists of chains cross-linked by both L- and D- amino acids in Bacteria.

Microbial Life: Prokaryotes – Structure, Diversity, and Antibiotic Resistance

Study Guide - Practice Questions