A-LevelBiologyTransport in mammalsFeb/Mar 2023Paper 1 Q201 Mark
The estimated total number of red blood cells in the human body is 2.5 × 10¹³. It is estimated that, each day, 2.5 × 10¹¹ red blood cells are removed from the circulation and are replaced by stem cells in the bone marrow. Which percentage of the total number of red blood cells is replaced each day?
A0.01%
B0.1%
C1%
D10%
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The correct answer is C. This question tests the candidate's understanding of transport in mammals 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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