A-LevelBiologyImmunityMay/June 2013Paper 1 Q371 Mark
A graft of tissue, such as skin, from a different person is usually rejected by the body. Which statement about graft rejection is correct?
AThe graft is rejected by B-lymphocytes because they make and release antibodies which react with the surface antigens on the graft cells.
BThe graft is rejected by B-lymphocytes because T-lymphocytes are not stimulated to produce antibodies.
CThe graft is rejected by T-lymphocytes because the graft tissue causes T-lymphocytes to release antibodies.
DThe graft is rejected by T-lymphocytes because they circulate in the blood and can gather at the graft site.
✓ Correct Answer
The correct answer is D. This question tests the candidate's understanding of immunity within the Biologysyllabus. The examiner's mark scheme requires...
📋 Examiner Report & Trap Analysis
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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