Pearson Edexcel Level 3 GCE 8BN0/01 2022 Biology A (Salters Nuffield) Advanced Subsidiary PAPER 1: Lifestyle, Transport, Genes and Health

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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 (a) The diagram shows part of a mRNA base sequence. A U G C U A G G C A C G U A U A C G G G C (i) Give the sequence of the first six bases of the DNA that was transcribed to give this mRNA sequence. (1) .................................................................................................................................................................................................................................................................................... (ii) Give the maximum number of amino acids that would be in the part of the polypeptide chain produced from this mRNA base sequence. (1) .................................................................................................................................................................................................................................................................................... (iii) Give the maximum number of different tRNA molecules that would be needed to produce the polypeptide chain produced from this base sequence. (1) .................................................................................................................................................................................................................................................................................... *P69494A0332* Turn over 3 (b) Describe the role of mRNA in protein synthesis. (3) .................................................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................................. [Show More]

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