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10 Questions

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Cell Structure and Function

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Questions and Answers

What is the main function of the cell membrane?

To regulate the balance of substances inside and outside the cell (correct)

To synthesize proteins within the cell

To generate energy for the cell

To provide structural support to the cell

How does a concentration gradient affect the movement of molecules?

Molecules move from low concentration to high concentration

Molecules move in a random direction regardless of concentration

Molecules move from high concentration to low concentration (correct)

Molecules remain stationary when there is a concentration gradient

Which cellular structure is responsible for ensuring stability by monitoring and adjusting internal conditions?

Mitochondria

Endoplasmic reticulum

Cell membrane (correct)

Nucleus

What is the primary driving force behind the movement of particles in diffusion?

Difference in concentration Signup and view all the answers

In what direction do molecules move during diffusion?

From high concentration to low concentration Signup and view all the answers

What is the main difference between osmosis and dialysis?

Osmosis involves the movement of water, while dialysis involves the diffusion of solutes Signup and view all the answers

Which statement best describes the role of Lugol solution as an indicator in detecting starch?

Lugol solution and starch combine to form a dark blue or purplish color because iodine passes through the semipermeable membrane Signup and view all the answers

In hypertonic solutions, how do cells react to the higher concentration of solute outside compared to inside?

Cells shrink as water moves out of them Signup and view all the answers

What distinguishes passive transport from active transport across a membrane?

Active transport involves moving molecules down their concentration gradient, whereas passive transport moves molecules against their concentration gradient Signup and view all the answers

How does the sodium-potassium pump function in terms of transporting ions across a cell membrane?

The sodium-potassium pump requires ATP to actively move sodium out and potassium into cells Signup and view all the answers