Question 1

Which of the following statements best explains why phospholipids form bilayers in aqueous environments?

Accepted Answer

The hydrophilic heads face the aqueous environment while the hydrophobic tails are sequestered away from water, resulting in a bilayer.

Question 2

A bacterium is observed to have multiple flagella at one end of the cell. Which flagellar arrangement does this describe?

Accepted Answer

Lophotrichous

Question 3

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

Accepted Answer

Gram-positive cell walls contain a thick layer of peptidoglycan, while Gram-negative cell walls have a thin peptidoglycan layer and an outer membrane.

Question 4

A cell is placed in a hypertonic solution. Predict the direction of water movement and the consequence for the cell.

Accepted Answer

Water will move out of the cell, causing it to shrink (plasmolysis).

Question 5

Which external structure allows bacteria to adhere to surfaces and form biofilms, but is not involved in motility?

Accepted Answer

Fimbriae

Question 6

Which transport mechanism requires energy and moves solutes against their concentration gradient?

Accepted Answer

Active transport

Question 7

Which of the following best describes the process of endospore formation in bacteria?

Accepted Answer

A vegetative cell undergoes sporulation, forming a highly resistant endospore within the cell.

Question 8

Which of the following is evidence supporting the endosymbiotic theory for the origin of mitochondria and chloroplasts?

Accepted Answer

Both organelles contain circular DNA similar to prokaryotes.

Question 9

Which equation best represents the net movement of solute across a membrane by simple diffusion?

Accepted Answer

$$ J = -D \frac{dC}{dx} $$

Question 10

Which of the following statements about archaeal cell walls is correct?

Accepted Answer

Archaeal cell walls are composed of pseudopeptidoglycan or other polymers, not peptidoglycan.

Question 11

Which organelle is responsible for ATP production in eukaryotic cells?

Accepted Answer

Mitochondria

Question 12

A bacterial cell is placed in an isotonic solution. What will happen to the cell?

Accepted Answer

There will be no net movement of water, and the cell will remain unchanged.

Question 13

Which of the following best describes the difference between prokaryotic and eukaryotic ribosomes?

Accepted Answer

Prokaryotic ribosomes are 70S, while eukaryotic ribosomes are 80S.

Question 14

Which bacterial external structure is primarily involved in conjugation (transfer of genetic material between cells)?

Accepted Answer

Pili

Question 15

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

Accepted Answer

Protection against desiccation and phagocytosis

Question 16

Which of the following best describes group translocation in bacteria?

Accepted Answer

A solute is transported across the membrane and chemically modified during transport.

Question 17

Which equation best describes osmosis across a semipermeable membrane?

Accepted Answer

$$ \Pi = iMRT $$

Question 18

Which of the following is NOT a component of the bacterial cytoplasm?

Accepted Answer

Mitochondria

Question 19

Which of the following statements about eukaryotic cell walls is correct?

Accepted Answer

Eukaryotic cell walls may be composed of cellulose or chitin, depending on the organism.

Question 20

A patient is infected with a bacterium that survives harsh conditions by forming endospores. Which property of endospores provides a selective advantage?

Accepted Answer

Endospores are highly resistant to heat, desiccation, and chemicals.

Cell Structure and Function: Comparative Analysis of Prokaryotic, Archaeal, and Eukaryotic Cells

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