A-LevelBiologyCell membranes and transportOct/Nov 2017Paper 1 Q171 Mark
Which row shows a correct function of the components of the cell surface membrane? [Figure 17.1 - table of cell surface membrane components and functions]
Aphospholipids: prevent the entry of non-polar molecules, cholesterol: regulates permeability of the membrane, proteins: allow exchange of ions between the cell and its environment, glycoproteins: allow cell-to-cell communication
Bphospholipids: prevent the entry of polar molecules, cholesterol: stabilises the membrane by binding to water molecules, proteins: allow cell-to-cell communication, glycoproteins: provide sites of attachment for hormones
Cphospholipids: regulate the flexibility of the cell membrane, cholesterol: prevents the entry of protons, proteins: allow exchange of gases between the cell and its environment, glycoproteins: stabilise the membrane by binding to water molecules
Dphospholipids: regulate the fluidity of the cell membrane, cholesterol: stabilises the membrane over a range of temperatures, proteins: form channels for polar molecules, glycoproteins: allow cell-to-cell recognition
✓ Correct Answer
The correct answer is D. This question tests the candidate's understanding of cell membranes and transport within the Biologysyllabus. The examiner's mark scheme requires...
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Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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