Question 1

Which of the following statements best describes the function of bacterial flagella?

Accepted Answer

They allow chemotaxis, enabling bacteria to move toward or away from chemical stimuli.

Question 2

A scientist observes a bacterium with a single flagellum located at one end of the cell. What is the correct term for this flagellar arrangement?

Accepted Answer

Monotrichous and polar

Question 3

Which structure is primarily responsible for bacterial conjugation and DNA transfer between cells?

Accepted Answer

Pili

Question 4

What is the main difference between a bacterial capsule and a slime layer?

Accepted Answer

Capsules are firmly attached and rigid, while slime layers are loosely attached and soft.

Question 5

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

Accepted Answer

Serving as a site for protein synthesis

Question 6

Endospores are primarily found in which type of bacteria, and what is their main function?

Accepted Answer

Gram-positive bacteria; survival in harsh conditions

Question 7

Which of the following statements about bacterial chromosomes and plasmids is correct?

Accepted Answer

Chromosomes are circular DNA containing essential genes, while plasmids are optional circular DNA with non-essential genes.

Question 8

A competitive inhibitor affects enzyme activity by:

Accepted Answer

Binding to the active site and blocking substrate access.

Question 9

Which of the following best explains why increasing substrate concentration can overcome competitive inhibition but not non-competitive inhibition?

Accepted Answer

Competitive inhibitors compete with the substrate for the active site, while non-competitive inhibitors alter the enzyme's shape at a different site.

Question 10

Which molecule is most important for cellular energy in microbes, and what is the maximum ATP yield per glucose in aerobic respiration?

Accepted Answer

ATP; 38 ATP

Question 11

A bacterium is found to have ether-linked plasma membrane lipids and pseudopeptidoglycan in its cell wall. To which domain does it most likely belong?

Accepted Answer

Archaea

Question 12

Which of the following is a function of gas vacuoles in aquatic bacteria?

Accepted Answer

Buoyancy regulation

Question 13

Which type of cell inclusion is used by Corynebacterium diphtheriae for identification and as a source of inorganic phosphate?

Accepted Answer

Metachromatic granules

Question 14

Which of the following statements about prokaryotes and eukaryotes is correct?

Accepted Answer

Eukaryotes have a nucleus, while prokaryotes do not.

Question 15

Which equation correctly represents the net ATP yield from fermentation of one glucose molecule?

Accepted Answer

$$2 	ext{ ATP}$$

Question 16

A patient is infected with Streptococcus pneumoniae. Which feature of this bacterium increases its virulence?

Accepted Answer

Production of a rigid capsule glycocalyx

Question 17

Which of the following is true regarding the ribosomes found in bacteria?

Accepted Answer

They are 70S ribosomes composed of 30S and 50S subunits.

Question 18

Which metabolic pathway yields the highest amount of ATP per glucose molecule in microbes?

Accepted Answer

Aerobic respiration

Question 19

Which of the following is a correct description of magnetosomes in bacteria?

Accepted Answer

They are magnetic particles that orient bacteria to Earth's magnetic field.

Question 20

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy and increase the reaction rate.

Microbe Anatomy: Structure and Function of Microbial Cells

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