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?

    <p>Difference in concentration</p> Signup and view all the answers

    In what direction do molecules move during diffusion?

    <p>From high concentration to low concentration</p> Signup and view all the answers

    What is the main difference between osmosis and dialysis?

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

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

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

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

    <p>Cells shrink as water moves out of them</p> Signup and view all the answers

    What distinguishes passive transport from active transport across a membrane?

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

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

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

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