AS & A Level Biology (9700) — May–June 2023, Paper 53
2 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
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A student noticed that a colour change occurred, from red to magenta, when the alginate beads with immobilised C. vulgaris were left in a container of hydrogencarbonate indicator…
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Suggest two variables that the scientists should have standardised in this investigation.
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