A-LevelBiologyCell membranes and transportFeb/Mar 2025Paper 1 Q171 Mark
The graph shows how the rate of facilitated diffusion of substance X across a cell surface membrane changed as the concentration of substance X increased. All conditions, except for the concentration of substance X, were kept constant. Temperature was maintained at 15°C. [Figure 17.1] Which statement about the rate of facilitated diffusion is correct?
AThe rate of facilitated diffusion of substance X at Q will increase if the temperature is increased to 20 °C.
BThe rate of facilitated diffusion of substance X at P will increase if the concentration of ATP is increased.
CThe rate of facilitated diffusion of substance X at Q will increase if the concentration of substance X is increased.
DThe rate of facilitated diffusion of substance X at P will increase if the length of time over which the rate is measured is increased.
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The correct answer is A. 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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