Question 1

Which of the following is a unique feature of bacterial cell walls that makes them an excellent target for antibiotics?

Accepted Answer

Presence of peptidoglycan

Question 2

Which of the following best describes the structure and function of the nucleoid in a bacterial cell?

Accepted Answer

A non-membrane-bound region containing looped coils of the chromosome

Question 3

Which of the following statements correctly distinguishes between the cell membrane lipids of Archaea and Bacteria?

Accepted Answer

Archaea have ether-linked isoprenoid chains, while Bacteria have ester-linked fatty acids

Question 4

A scientist is studying a prokaryote with a cell wall that lacks peptidoglycan but contains pseudomurein. This organism is most likely:

Accepted Answer

An archaeon

Question 5

Which of the following best explains why Gram-positive bacteria retain the crystal violet stain during the Gram staining procedure?

Accepted Answer

They have a thick layer of peptidoglycan that traps the stain

Question 6

Which of the following is a function of the bacterial flagellum?

Accepted Answer

Motility via rotary motion

Question 7

A molecule moves across a bacterial cell membrane from an area of low concentration to high concentration. Which process is most likely responsible?

Accepted Answer

Active transport

Question 8

Which of the following equations correctly represents the dissociation of a membrane-permeant weak acid?

Accepted Answer

$$\mathrm{HA \rightleftharpoons H^+ + A^-}$$

Question 9

Which of the following is a major chemical component shared by all prokaryotic cells?

Accepted Answer

Water

Question 10

Which of the following best describes the role of planar molecules such as hopanoids in bacterial membranes?

Accepted Answer

They fill gaps between hydrocarbon chains to stabilize the membrane

Question 11

A bacterium is found to be sensitive to streptomycin and contains formyl-methionine as the initiator tRNA. Which domain does it most likely belong to?

Accepted Answer

Bacteria

Question 12

Which of the following statements about the bacterial cytoplasm is correct?

Accepted Answer

It is a gel-like network containing proteins, DNA, and small molecules

Question 13

Which of the following is a distinguishing feature of Gram-negative bacteria?

Accepted Answer

Presence of an outer membrane containing lipopolysaccharide (LPS)

Question 14

Which of the following best explains how hydrophilic proteins can reside in the hydrophobic region of the cell membrane?

Accepted Answer

They have hydrophobic regions that interact with the membrane interior

Question 15

Which of the following is true regarding the genetic material in prokaryotes?

Accepted Answer

It is typically a single, circular chromosome located in the nucleoid

Question 16

Which of the following best describes the difference in cell envelope structure between Gram-positive and Gram-negative bacteria?

Accepted Answer

Gram-negative bacteria have a thin peptidoglycan layer and an outer membrane, Gram-positive have a thick peptidoglycan layer

Question 17

Which of the following is a real-world application of understanding peptidoglycan biosynthesis in bacteria?

Accepted Answer

Designing antibiotics that inhibit cell wall synthesis

Question 18

Which of the following best describes the function of teichoic acids in Gram-positive bacteria?

Accepted Answer

They stabilize the thick peptidoglycan layer

Question 19

Which of the following is a physiological difference between Archaea and Bacteria?

Accepted Answer

Bacteria have ester-linked fatty acids in their membranes, while Archaea have ether-linked isoprenoids

Question 20

Which of the following best explains why selective transport across the cell membrane is essential for bacterial survival?

Accepted Answer

It ensures that essential nutrients enter and harmful substances are excluded

Bacterial and Archaeal Cell Structure and Function

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