Strengths: binomial naming, cell structure, translocation, respiration, synaptic transmission, IVF.
Weaker areas: biological molecules, limiting factors of photosynthesis, digestion/absorption, exercise response, examples of variation.
Exam technique: read diagrams/graphs carefully (e.g. Q22, Q24, Q30, Q34) and work methodically through info (e.g. Q19, Q20, Q32, Q36, Q38).
Confusion about arthropod groups; some thought arachnids have three pairs of legs (should be four).
Active transport generally understood, but several missed the need for a membrane carrier protein.
Most correctly matched macromolecules to their subunits; a few thought fat is made from glycogen.
Some believed bile is made in the gall bladder rather than stored there.
Careful reading required; some chose option A which had villus features but not all essential for glucose absorption.
Stimulus for increased breathing rate during exercise is raised CO?, not decreased O?—commonly mixed up.
Most knew the cornea focuses/refracts; a few incorrectly credited the pupil.
Some confusion between FSH and LH led to wrong selections.
Identifying types of variation proved demanding; many incorrectly treated pea seed colour as continuous variation.
Nitrogen cycle misconceptions: some thought nitrogen fixation makes N? from nitrate (that’s denitrification).
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