Q: Which equation correctly represents the relationship between surface area and volume for a spherical cell?

$$\text{Surface Area} = 4\pi r^2$

Question 1

Which organelle is primarily responsible for the modification, sorting, and packaging of proteins and lipids for secretion or delivery to other organelles?

Accepted Answer

Golgi apparatus

Question 2

A cell is observed to have a large central vacuole. Which function is most likely associated with this structure in plant cells?

Accepted Answer

Cell pressure maintenance

Question 3

Which process involves the lysosome fusing with a food vacuole to digest engulfed particles?

Accepted Answer

Phagocytosis

Question 4

Peroxisomes contain the enzyme catalase, which breaks down hydrogen peroxide. What is the chemical equation for this reaction?

Accepted Answer

$$2H_2O_2 \rightarrow 2H_2O + O_2$

Question 5

Which of the following best describes the structure of the plasma membrane?

Accepted Answer

A fluid mosaic of phospholipids and proteins

Question 6

Why do membranes with more saturated phospholipids show less protein mixing at low temperatures?

Accepted Answer

Saturated phospholipids decrease membrane fluidity at low temperatures

Question 7

Which type of cytoskeletal fiber is the thickest and is composed of tubulin polymers?

Accepted Answer

Microtubules

Question 8

A mutation causes a cell to lack functional lysosomes. Which cellular process would be most directly affected?

Accepted Answer

Digestion of macromolecules and damaged organelles

Question 9

Which property of the plasma membrane allows small nonpolar molecules to pass through easily?

Accepted Answer

Hydrophobic interior

Question 10

Which equation correctly represents the relationship between surface area and volume for a spherical cell?

Accepted Answer

$$	ext{Surface Area} = 4\pi r^2$

Question 11

Which of the following is NOT a function of membrane proteins?

Accepted Answer

DNA replication

Question 12

A cell is exposed to a toxin that disrupts actin polymerization. Which cellular structure would be most affected?

Accepted Answer

Microfilaments

Question 13

Which of the following statements about diffusion is correct?

Accepted Answer

Diffusion moves molecules from high to low concentration

Question 14

If a cell increases in size, what happens to its surface area to volume ratio?

Accepted Answer

It decreases

Question 15

Which organelle is most directly involved in autophagy?

Accepted Answer

Lysosome

Question 16

Which of the following molecules would have the most difficulty crossing the plasma membrane without a transport protein?

Accepted Answer

Glucose

Question 17

Which cytoskeletal element is most important for the movement of cilia and flagella?

Accepted Answer

Microtubules

Question 18

Which of the following best explains why cells are generally small?

Accepted Answer

Small cells have a higher surface area to volume ratio, facilitating efficient diffusion of materials.

Question 19

Which type of membrane protein is embedded within the lipid bilayer and often spans the entire membrane?

Accepted Answer

Integral protein

Question 20

A scientist labels membrane proteins in mouse and human cells, then fuses the cells and incubates at different temperatures. What is the expected result at higher temperatures?

Accepted Answer

Proteins mix more rapidly due to increased membrane fluidity

Cell Structure, Endomembrane System, and Membrane Function

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