Question 1

Which organelle is primarily responsible for synthesizing ATP during cellular respiration in eukaryotic cells?

Accepted Answer

Mitochondrion

Question 2

A scientist observes a cell with a large central vacuole, cell wall, and chloroplasts. Which type of cell is most likely being observed?

Accepted Answer

Plant cell

Question 3

Which of the following best describes the function of ribosomes?

Accepted Answer

Protein synthesis

Question 4

The rough endoplasmic reticulum (ER) is distinguished from the smooth ER by the presence of:

Accepted Answer

Ribosomes

Question 5

Which equation correctly represents the surface area to volume ratio for a cube with side length $$l$$?

Accepted Answer

$$\frac{6l^2$}{l^3$}$$

Question 6

A cell is placed in a solution with a higher concentration of solutes than inside the cell. What will most likely happen to the cell?

Accepted Answer

It will shrink due to water leaving the cell.

Question 7

Which of the following statements about the fluid mosaic model of the plasma membrane is correct?

Accepted Answer

Phospholipids and proteins can move laterally within the membrane.

Question 8

Which process requires energy input from the cell and moves substances against their concentration gradient?

Accepted Answer

Active transport

Question 9

The Na$$^+/K$^+$$ ATPase pump is an example of:

Accepted Answer

Active transport

Question 10

Which of the following best explains why cells are typically small in size?

Accepted Answer

Smaller cells have a higher surface area to volume ratio, which increases efficiency of material exchange.

Question 11

Which organelle is responsible for modifying, sorting, and packaging proteins for secretion?

Accepted Answer

Golgi apparatus

Question 12

A patient is diagnosed with a genetic disorder that affects lysosomal enzymes. Which cellular process is most likely impaired?

Accepted Answer

Intracellular digestion of macromolecules

Question 13

Which of the following is a major difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have a nucleus, while prokaryotic cells do not.

Question 14

Which of the following best describes osmosis?

Accepted Answer

Movement of water across a selectively permeable membrane from low to high solute concentration

Question 15

If a cell membrane is permeable to water but not to solutes, what will happen when the cell is placed in a hypertonic solution?

Accepted Answer

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

Question 16

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

Accepted Answer

Synthesizing proteins

Question 17

Which equation represents the calculation of the volume of a sphere with radius $$r$$?

Accepted Answer

$$\frac{4}{3}\pi r^3$

Question 18

Which of the following statements about facilitated diffusion is correct?

Accepted Answer

It moves substances down their concentration gradient using transport proteins.

Question 19

A neuron transmits signals by allowing ions to flow across its membrane. Which property of the membrane is most critical for this function?

Accepted Answer

Selective permeability

Question 20

Which of the following best explains the role of cholesterol in the plasma membrane?

Accepted Answer

It stabilizes membrane fluidity by preventing extremes in flexibility and rigidity.

Question 21

Which of the following is a real-world example of active transport in human physiology?

Accepted Answer

Na$$^+/K$^+$$ pump maintaining nerve cell resting potential

General Biology Study Notes: Cell Structure, Membrane Transport, and Osmoregulation

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