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Membrane structure, protein channels and bulk transport

12th grade (Year 13 in England) · 16 questions · Common Core: NGSS.HS-LS1-2, NGSS.HS-LS1-3 · England: A level Biology: Cell membranes (extension)

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  1. Question 1

    What are the two parts of a phospholipid molecule?

    • A. a nucleus and a membrane
    • B. a protein and a sugar
    • C. a hydrophilic (water-loving) head and two hydrophobic (water-fearing) tails
    • D. two heads and no tails

  2. Question 2

    Membranes: which statement is true?

    • A. Phospholipid tails are attracted to water.
    • B. Large proteins pass through the membrane by simple diffusion.
    • C. The sodium–potassium pump uses ATP.
    • D. Facilitated diffusion moves substances against their gradient.

  3. Question 3

    Is this passive or active transport: osmosis through aquaporin channels?

    • A. passive (no ATP needed)
    • B. active (uses ATP)

  4. Question 4

    Why can oxygen cross the membrane easily but glucose needs a protein?

    • A. Oxygen is too big for proteins
    • B. Glucose dissolves in fat
    • C. Glucose is a gas
    • D. Oxygen is small and non-polar; glucose is larger and polar

  5. Question 5

    Membranes: which statement is true?

    • A. Exocytosis releases substances from a cell in vesicles.
    • B. Large proteins pass through the membrane by simple diffusion.
    • C. Phospholipid tails are attracted to water.
    • D. Facilitated diffusion moves substances against their gradient.

  6. Question 6

    Is this passive or active transport: simple diffusion of oxygen through the phospholipid bilayer?

    • A. passive (no ATP needed)
    • B. active (uses ATP)

  7. Question 7

    Why can oxygen cross the membrane easily but glucose needs a protein?

    • A. Oxygen is small and non-polar; glucose is larger and polar
    • B. Oxygen is too big for proteins
    • C. Glucose dissolves in fat
    • D. Glucose is a gas

  8. Question 8

    Membranes: which statement is true?

    • A. Large proteins pass through the membrane by simple diffusion.
    • B. Phospholipid tails are attracted to water.
    • C. The cell membrane is a phospholipid bilayer with proteins in it.
    • D. Facilitated diffusion moves substances against their gradient.

  9. Question 9

    Is this passive or active transport: osmosis through aquaporin channels?

    • A. passive (no ATP needed)
    • B. active (uses ATP)

  10. Question 10

    What are the two parts of a phospholipid molecule?

    • A. a hydrophilic (water-loving) head and two hydrophobic (water-fearing) tails
    • B. a nucleus and a membrane
    • C. two heads and no tails
    • D. a protein and a sugar

  11. Question 11

    Membranes: which statement is true?

    • A. Large proteins pass through the membrane by simple diffusion.
    • B. Facilitated diffusion uses carrier or channel proteins but no ATP.
    • C. Phospholipid tails are attracted to water.
    • D. Facilitated diffusion moves substances against their gradient.

  12. Question 12

    Is this passive or active transport: simple diffusion of oxygen through the phospholipid bilayer?

    • A. passive (no ATP needed)
    • B. active (uses ATP)

  13. Question 13

    Cystic fibrosis is caused by a faulty chloride ion channel protein. What does this show?

    • A. Phospholipids are made of chloride
    • B. Ions cross membranes without help
    • C. Membrane proteins are vital for moving specific ions across membranes
    • D. Channel proteins carry oxygen

  14. Question 14

    Membranes: which statement is true?

    • A. Phospholipid tails are attracted to water.
    • B. The sodium–potassium pump uses ATP.
    • C. Large proteins pass through the membrane by simple diffusion.
    • D. Facilitated diffusion moves substances against their gradient.

  15. Question 15

    Is this passive or active transport: simple diffusion of oxygen through the phospholipid bilayer?

    • A. passive (no ATP needed)
    • B. active (uses ATP)

  16. Question 16

    Why can oxygen cross the membrane easily but glucose needs a protein?

    • A. Oxygen is small and non-polar; glucose is larger and polar
    • B. Oxygen is too big for proteins
    • C. Glucose dissolves in fat
    • D. Glucose is a gas

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Answer key: Membrane structure, protein channels and bulk transport

  1. 1. C. a hydrophilic (water-loving) head and two hydrophobic (water-fearing) tails

  2. 2. C. The sodium–potassium pump uses ATP.

  3. 3. A. passive (no ATP needed)

  4. 4. D. Oxygen is small and non-polar; glucose is larger and polar

  5. 5. A. Exocytosis releases substances from a cell in vesicles.

  6. 6. A. passive (no ATP needed)

  7. 7. A. Oxygen is small and non-polar; glucose is larger and polar

  8. 8. C. The cell membrane is a phospholipid bilayer with proteins in it.

  9. 9. A. passive (no ATP needed)

  10. 10. A. a hydrophilic (water-loving) head and two hydrophobic (water-fearing) tails

  11. 11. B. Facilitated diffusion uses carrier or channel proteins but no ATP.

  12. 12. A. passive (no ATP needed)

  13. 13. C. Membrane proteins are vital for moving specific ions across membranes

  14. 14. B. The sodium–potassium pump uses ATP.

  15. 15. A. passive (no ATP needed)

  16. 16. A. Oxygen is small and non-polar; glucose is larger and polar