Question 1

Which of the following statements best explains why understanding prokaryotic cell shapes and arrangements is important in microbiology?

Accepted Answer

It aids in the identification of certain pathogens.

Question 2

A microbiologist observes a cluster of spherical bacteria under the microscope. Which arrangement and shape best describes this observation?

Accepted Answer

Staphylococci

Question 3

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

Accepted Answer

Gram-negative bacteria have a double membrane and contain lipopolysaccharide (LPS).

Question 4

During binary fission in prokaryotes, what is the correct sequence of events?

Accepted Answer

DNA replicates, cell elongates, septum forms, daughter cells separate

Question 5

Which of the following best describes the function of the plasma membrane in prokaryotic cells?

Accepted Answer

It acts as a selectively permeable barrier, allowing certain substances to enter or exit the cell.

Question 6

A bacterium is found to have a cell wall that releases lipid A when it dies. What is the clinical significance of this feature?

Accepted Answer

Lipid A is an endotoxin that can trigger severe immune responses in humans.

Question 7

Which of the following factors would most likely increase the fluidity of a prokaryotic cell membrane?

Accepted Answer

Increasing the proportion of unsaturated fatty acids

Question 8

A patient is infected with a bacterium that forms chains of rod-shaped cells. Which term best describes this arrangement?

Accepted Answer

Streptobacilli

Question 9

Which of the following is NOT a characteristic of prokaryotic cells?

Accepted Answer

They contain membrane-bound organelles.

Question 10

Why is membrane fluidity essential for prokaryotic cell function?

Accepted Answer

It enables proteins and lipids to move to areas where they are most needed.

Question 11

Which of the following best describes the arrangement of Streptococcus bacteria?

Accepted Answer

Chains of cocci

Question 12

A researcher is studying a bacterium that can change its shape depending on environmental conditions. What term best describes this property?

Accepted Answer

Pleomorphic

Question 13

Which of the following equations best represents the process of binary fission in prokaryotes?

Accepted Answer

$$2^n$$

Question 14

Which of the following would most likely decrease the fluidity of a prokaryotic cell membrane at low temperatures?

Accepted Answer

Increasing the proportion of saturated fatty acids

Question 15

Which of the following best describes the role of NAG and NAM in prokaryotic cells?

Accepted Answer

They are building blocks for peptidoglycan in the cell wall.

Question 16

A Gram-negative bacterium is more likely than a Gram-positive bacterium to:

Accepted Answer

Release endotoxin upon cell death

Question 17

Which of the following best explains why pleomorphic bacteria may have an advantage in transmission to new hosts?

Accepted Answer

They can take on different forms, enhancing survival and transmission.

Question 18

Which of the following is true regarding the selective permeability of the prokaryotic plasma membrane?

Accepted Answer

Only water and small non-charged substances can diffuse freely; ions and larger polar substances require protein transporters.

Question 19

A bacterium is observed to have a palisade arrangement. What does this mean?

Accepted Answer

It forms clusters of bacilli aligned side by side.

Question 20

Which of the following best describes the fluid mosaic model of the prokaryotic plasma membrane?

Accepted Answer

A dynamic structure where lipids and proteins move around within the bilayer.

Prokaryotic Cell Structure, Morphology, and Division

Study Guide - Practice Questions