IB Biology HL B2.1.1 Lipid Bilayers As Basis Questions
Explain how phospholipid heads and tails orient in water, then identify bilayers in plasma membranes, vesicles and nuclear envelopes.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- Identify phospholipids as amphipathic molecules with hydrophilic phosphate heads and hydrophobic fatty-acid tails.
- Explain how phospholipids form a continuous, closed bilayer in water, with hydrophilic heads facing water and hydrophobic tails directed inwards.
- Identify phospholipid bilayers in plasma membranes, vesicles and nuclear envelopes, and distinguish them from a nucleoid.
IB Biology HL B2.1.1 Lipid Bilayers As Basis Questions question 1
[Maximum number: 2]
Outline how the amphipathic properties of phospholipids play a role in membrane structure.
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
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