Diffusion：练习题

• a.

  Diffusion

• b.

  Osmosis

• c.

  Phagocytosis

• d.

  Active transport

• a.

  Diffusion requires transport proteins and occurs against a concentration gradient; active transport does not require transport proteins and occurs down a concentration gradient.

• b.

  Diffusion requires ATP and occurs down a concentration gradient; active transport requires no ATP and occurs against a concentration gradient.

• c.

  Diffusion does not require cellular energy and occurs down a concentration gradient; active transport requires ATP and occurs against a concentration gradient.

• d.

  Diffusion only occurs across non-living membranes; active transport occurs across both living and non-living membranes.

• a.

  Oxygen is actively transported from blood plasma into tissue fluid using energy from red blood cells.

• b.

  Oxygen diffuses from tissue fluid into blood plasma down its concentration gradient.

• c.

  Carbon dioxide is actively transported from tissue fluid into blood plasma against a concentration gradient.

• d.

  Carbon dioxide diffuses down its concentration gradient from body cells into tissue fluid and then into blood plasma.

• a.

  Increasing the surface area of the membrane

• b.

  Increasing the concentration gradient

• c.

  Increasing the temperature of the solution

• d.

  Increasing the thickness of the membrane

• a.

  Oxygen consumption decreases; nitrate ion uptake decreases

• b.

  Oxygen consumption remains unchanged; nitrate ion uptake decreases

• c.

  Oxygen consumption increases; nitrate ion uptake increases

• d.

  Oxygen consumption decreases; nitrate ion uptake remains unchanged

先自己写一遍答案，再对照解题步骤。