IB Biology HL B2.1.1 Lipid Bilayers Question Bank
Practise IB Biology HL B2.1.1 by extending amphipathic phospholipids into membrane organisation and aqueous compartment formation.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- Analyse amphipathic phospholipid orientation in membranes, vesicles and aqueous compartments.
- Use hydrophilic-head and hydrophobic-tail evidence to explain membrane organisation and stability.
B2.1.1—Lipid bilayers as basis question 1
[Maximum number: 2]
Outline how the amphipathic properties of phospholipids play a role in membrane structure.
i
a part hydrophobic/not attracted to water/non-polar AND part hydrophilic/attracted to water/polar;
b bilayer formed (formed naturally by phospholipids in water);
c hydrophilic heads/parts face outwards and hydrophobic tails/parts face inwards;
Marking guidance:
Do not allow water loving/hating in mpa or mpc
2 max
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