Pearson Edexcel Level 3 GCE: Biology B Advanced PAPER 2: Advanced Physiology, Evolution and Ecology

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Answer ALL questions. Write your answers in the spaces provided. Some questions must be answered with a cross in a box . If you change your mind about an answer, put a line through the box and then... mark your new answer with a cross . 1 The diagram shows DNA replication. X (a) Which of the following is the name of the bond labelled X on the diagram? (1) A ester B glycosidic C hydrogen D phosphodiester (b) Describe the roles of three named enzymes involved in DNA replication. (3) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (c) A section of double-stranded DNA has a total number of 10000 nucleotides. Adenine makes up 35% of the nucleotides in this section of double-stranded DNA. Calculate the total number of cytosine nucleotides found in this section of DNA. [Show More]

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