Q: Which of the following equations best represents the relationship between surface area (SA) and volume (V) for a spherical cell?

$$\text{Surface area to volume ratio} = \frac{4 \pi r^2$}{\frac{4}{3} \pi r^3$}$$

Question 1

Which of the following structures is found in both prokaryotic and eukaryotic cells and is primarily responsible for controlling the passage of substances into and out of the cell?

Accepted Answer

Cytoplasmic membrane

Question 2

A patient is diagnosed with a bacterial infection. The bacteria are found to have a thick peptidoglycan layer and no outer membrane. Which type of cell wall do these bacteria possess?

Accepted Answer

Gram-positive

Question 3

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

Accepted Answer

Motility

Question 4

Which process requires energy input and moves substances against their concentration gradient across the cytoplasmic membrane?

Accepted Answer

Active transport

Question 5

A scientist observes a cell with a nucleus, mitochondria, and a cytoskeleton. Which type of cell is being observed?

Accepted Answer

Eukaryotic cell

Question 6

Which of the following statements about peptidoglycan is TRUE?

Accepted Answer

It is a major component of Gram-positive bacterial cell walls.

Question 7

Which structure allows bacteria to transfer DNA from one cell to another during conjugation?

Accepted Answer

Pili

Question 8

Where are lipopolysaccharides (LPS) primarily found?

Accepted Answer

In the outer membrane of Gram-negative bacterial cell walls

Question 9

Which of the following best describes the ribosomes found in eukaryotic cells?

Accepted Answer

Eukaryotic ribosomes are 80S.

Question 10

Which organelle is responsible for receiving, processing, and packaging large molecules that are destined to be secreted from the cell?

Accepted Answer

Golgi body

Question 11

A bacterium is observed to move toward a chemical attractant. Which structure is primarily responsible for this movement?

Accepted Answer

Flagella

Question 12

Which of the following is a characteristic unique to archaeal cell walls?

Accepted Answer

Presence of pseudopeptidoglycan

Question 13

Which of the following processes is found only in eukaryotic cells and not in prokaryotic cells?

Accepted Answer

Endocytosis

Question 14

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

Accepted Answer

Motility

Question 15

Which of the following equations best represents the relationship between surface area (SA) and volume (V) for a spherical cell?

Accepted Answer

$$	ext{Surface area to volume ratio} = \frac{4 \pi r^2$}{\frac{4}{3} \pi r^3$}$$

Question 16

Which of the following is a function of the cytoskeleton in eukaryotic cells?

Accepted Answer

Providing structural support and shape

Question 17

Which of the following statements about biofilms is TRUE?

Accepted Answer

Biofilms protect bacteria from environmental stress.

Question 18

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

Accepted Answer

Presence of membrane-bound organelles

Question 19

Which of the following best describes the function of endospores in bacteria?

Accepted Answer

Allow survival in harsh conditions

Question 20

Which of the following structures is responsible for the synthesis of proteins in both prokaryotic and eukaryotic cells?

Accepted Answer

Ribosome

Chpt 3 Lecture Cell Structure and Function in Microbiology

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