Question 1

Which of the following best describes the function of magnetosomes in magnetotactic bacteria?

Accepted Answer

They help bacteria orient and swim along magnetic field lines.

Question 2

A bacterium is observed to move toward a source of glucose. Which process is responsible for this directed movement?

Accepted Answer

Chemotaxis

Question 3

Which structure is responsible for bacterial motility and is powered by a rotary motor embedded in the cell membrane?

Accepted Answer

Flagella

Question 4

Gram-positive and Gram-negative bacteria differ in their cell wall structure. Which feature is unique to Gram-negative bacteria?

Accepted Answer

Presence of an outer membrane

Question 5

Which of the following is NOT a method by which bacteria achieve selective permeability for nutrient uptake?

Accepted Answer

Passive diffusion through the lipid bilayer

Question 6

Facilitated diffusion differs from active transport in which of the following ways?

Accepted Answer

Facilitated diffusion moves molecules down their concentration gradient without energy input.

Question 7

Which equation correctly represents the hydrolysis of ATP that powers ABC transporters?

Accepted Answer

$$ATP \rightarrow ADP + Pi$$

Question 8

A bacterium uses a symport system to import lactose. Which statement best describes this process?

Accepted Answer

Lactose and a driving ion move in the same direction across the membrane.

Question 9

Which specialized structure allows bacteria to exchange genetic material during conjugation?

Accepted Answer

Pili

Question 10

Which of the following is a major macronutrient required for microbial growth?

Accepted Answer

Carbon (C)

Question 11

What is the primary function of siderophores in bacteria?

Accepted Answer

To scavenge iron from the environment

Question 12

Which of the following statements about autotrophs is correct?

Accepted Answer

Autotrophs fix $$CO_2$$ and assemble it into organic molecules.

Question 13

During chemotaxis, what is the result of counterclockwise (CCW) rotation of bacterial flagella?

Accepted Answer

The bacterium moves in a straight 'run' toward an attractant.

Question 14

Which of the following is a trace element (micronutrient) necessary for enzyme function in bacteria?

Accepted Answer

Copper (Cu)

Question 15

Which structure is found in cyanobacteria and is responsible for photosynthetic activity?

Accepted Answer

Thylakoid

Question 16

A bacterial cell is observed to have numerous vesicles released from its membrane. What is a likely function of these membrane vesicles?

Accepted Answer

Intercellular communication and transport of molecules

Question 17

Which of the following best describes the role of carboxysomes in bacteria?

Accepted Answer

They concentrate $$CO_2$$ for carbon fixation.

Question 18

Which process allows bacteria to move a solute against its concentration gradient using energy from ATP hydrolysis?

Accepted Answer

ABC transporter-mediated active transport

Question 19

Which of the following is a correct description of antiport transport in bacteria?

Accepted Answer

The actively transported molecule moves in the opposite direction to the driving ion.

Question 20

Which of the following structures is NOT typically found in prokaryotic cells?

Accepted Answer

Nucleus

Bacterial Cell Structure, Specialized Structures, Motility, and Nutrient Uptake

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