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A-Level BiologyYear 2021Q6

18 6 The diagram shows four stages in a human cell cycle. G2 of interphase S phase of interphase G1 of interphase mitosis and cytokinesis (a) The cell cycle time for this cell is 24 hours. Give an estimate for the length of time that this cell spends in each of the four stages of the cell cycle. (2) Stage of cell cycle Estimate for the length of time that this cell spends in each stage / hours mitosis and cytokinesis G1 of interphase S phase of interphase G2 of interphase (b) The percentage of cells in any one stage is proportional to the length of time of that stage. Describe an investigation that could be carried out to confirm the length of time of mitosis and cytokinesis for these human cells. 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(c) A cell in G1 of interphase contains 68 arbitrary units of DNA. Explain how the DNA content and the structure of the chromosomes of this cell will change during the cell cycle. 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(Total for Question 6 = 11 marks)

Paper Source:8BI0_01_que_20211012.pdf

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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.

Syllabus levelAdvanced Level (A-Level)

SubjectBiology

Official MarksVariable (2–6 marks)