Cell Membrane and Permeability

Lesson 4.1 — BIO.1D.1

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Lesson 4.1 · Cell Membrane and Permeability (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. Label the cell membrane
  2. Parts of a phospholipid
  3. Function of the cell membrane
  4. Which particles can cross?
  5. How does each molecule cross?
  6. The three transport proteins
  7. What does each part do?
  8. Concentration gradient

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.

A semipermeable membrane lets some substances through and blocks others. Small nonpolar molecules cross easily; large or charged ones need a transport protein.