Page 02 SECTION 1 — 25 marks Attempt ALL questions 1. Trypan blue is used as a vital stain to identify viable cells when viewed in a haemocytometer. A vital stain A stains all cells B only stains dead cells C only stains living cells D only stains the culture medium. 2. Bovine insulin is a soluble protein with an isoelectric point of pH 5·4. Which of the following graphs represents the level of precipitate formed as the pH of a bovine insulin solution is changed? 9 9 9 9 1 1 1 1 pH pH pH pH mass of precipitate (mg) mass of precipitate (mg) mass of precipitate (mg) mass of precipitate (mg) C A B D
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Exam Specification Info
This question is part of the UK A-Level Biology syllabus. In the actual exam, structured questions typically require linking specific keywords to gain full marks. Applaa helps you drill these topics.
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