A-LevelBiologyImmunity9700/12 · Oct/Nov 2012 · Q371 Mark

The graph shows the primary and secondary responses of the immune system to antigens. [Figure 37.1] What are responses X and Y?

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AX: primary response, Y: secondary response caused by cloning of B-lymphocytes formed during the primary response

BX: primary response, Y: secondary response caused by cloning of T-lymphocytes formed during the primary response

CX: secondary response caused by cloning of B-lymphocytes formed during the primary response, Y: primary response

DX: secondary response caused by cloning of T-lymphocytes formed during the primary response, Y: primary response

✓ Correct answer

C: X: secondary response caused by cloning of B-lymphocytes formed during the primary response, Y: primary response

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