Passive and Active Transport

Lesson 4.2 — BIO.1D.1

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Lesson 4.2 · Passive and Active Transport (BIO.1D.1). Work through the numbered activities in order. Answer every part, then press Check. Your score and completion code are at the end.

Activities (in order):

  1. Passive and active transport
  2. Passive or active?
  3. What route does each one use?
  4. Simple and facilitated diffusion
  5. Dynamic equilibrium
  6. Bulk transport
  7. Protein pumps

Each numbered activity matches a heading on the page.

Work through every activity in order. Answer all parts, then press Check. You cannot change an answer once it is checked, so think first.

Warm-up · not scored

Click the buttons and watch what changes.

Passive transport moves substances down the concentration gradient and needs no energy. Active transport moves them against the gradient and uses ATP.