Question 1

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

Accepted Answer

Mitochondrion

Question 2

A cell is observed to have a large number of ribosomes attached to its rough endoplasmic reticulum. What is the most likely function of this cell?

Accepted Answer

Protein secretion

Question 3

Which of the following best explains why the surface area-to-volume ratio is important for cell function?

Accepted Answer

It affects the efficiency of material exchange with the environment.

Question 4

A scientist discovers a cell with a single circular chromosome, no membrane-bound organelles, and a cell wall made of peptidoglycan. What type of cell is this?

Accepted Answer

Prokaryotic bacterial cell

Question 5

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

Accepted Answer

Proteins and lipids can move laterally within the membrane.

Question 6

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

Accepted Answer

Active transport

Question 7

A red blood cell is placed in a hypotonic solution. What will most likely happen to the cell?

Accepted Answer

It will swell and possibly burst due to water influx.

Question 8

Which of the following is a function of the Golgi apparatus?

Accepted Answer

Modification and sorting of proteins

Question 9

Which equation correctly represents the calculation of surface area-to-volume ratio for a spherical cell?

Accepted Answer

$\frac{4 \pi r^2}{\frac{4}{3} \pi r^3}$

Question 10

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

Accepted Answer

It stabilizes membrane fluidity across temperature changes.

Question 11

A cell needs to import glucose from the extracellular environment. Which membrane transport mechanism is most likely used?

Accepted Answer

Facilitated diffusion via a carrier protein

Question 12

Which of the following statements about eukaryotic and prokaryotic cells is true?

Accepted Answer

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

Question 13

Which organelle contains hydrolytic enzymes and is involved in breaking down cellular waste?

Accepted Answer

Lysosome

Question 14

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

Accepted Answer

To maintain a high surface area-to-volume ratio for efficient exchange of materials.

Question 15

Which of the following is NOT a function of the smooth endoplasmic reticulum (SER)?

Accepted Answer

Protein synthesis

Question 16

A neuron transmits signals using changes in membrane potential. Which property of the plasma membrane is most critical for this function?

Accepted Answer

Selective permeability to ions

Question 17

Which equation represents the net movement of water across a semipermeable membrane due to osmosis?

Accepted Answer

$\Delta \Psi = \Psi_{inside} - \Psi_{outside}$

Question 18

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

Accepted Answer

Sodium-potassium pump maintaining ion gradients in neurons

Question 19

Which statement best describes the difference between facilitated diffusion and active transport?

Accepted Answer

Facilitated diffusion moves substances down their concentration gradient, while active transport moves them against it.

Question 20

Which of the following is a consequence of low surface area-to-volume ratio in large cells?

Accepted Answer

Decreased rate of material exchange with the environment

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

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