A-LevelBiologyCell structureOct/Nov 2020Paper 2 Q415 Marks
In the immune system, a plasma cell develops from an activated B-lymphocyte. Mature plasma cells synthesise and secrete antibody molecules. (a) Fig. 4.1 is a diagram of a transmission electron micrograph of a plasma cell. [Figure 4.1] The plasma cell can be seen in greater detail using an electron microscope compared with using a light microscope.
📋 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...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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