IB Biology SL B2.1.1 Lipid Bilayers As Basis Questions

Explain how amphipathic phospholipids orient in water to form closed bilayers, then identify those bilayers in plasma membranes, nuclei and vesicles in IB Biology SL B2.1.1.

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Identify phospholipids as amphipathic molecules with hydrophilic phosphate heads and hydrophobic fatty-acid tails.
Explain how phospholipids spontaneously arrange in water with heads facing aqueous surroundings and tails shielded inside a continuous closed bilayer.
Use membrane diagrams to identify phospholipid bilayers as the structural basis of plasma membranes, nuclei and vesicles, distinguishing them from nucleoid regions.

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Study B2.1.1—Lipid bilayers as basis conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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The diagram shows the stages of the cell cycle.

Figure for Question IB Biology SL B2.1.1 Lipid Bilayers As Basis Questions question 1 — IB Biology SL

Explain the properties of phospholipids that allow bilayers to form in cell membranes.

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IB Biology SL B2.1.1 Lipid Bilayers As Basis Questions question 1