AS BIOLOGY Paper 1. EXAM PREDICTION QUESTIONS AND ANSWERS. RATED A+

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igure 1 shows part of a DNA molecule. Figure 1 0 1 . 1 Name the type of bond between: [2 marks] complementary base pairs adjacent nucleotides in a DNA strand 0 1 . 2 The length of a gene is desc... ribed as the number of nucleotide base pairs it contains. Use information in Figure 1 to calculate the length of a gene containing 4.38 ×103 base pairs. [2 marks] Answer nm3 *03* Turn over ► IB/M/Jun21/7401/1 Do not write outside the 0 1 . 3 Describe two differences between the structure of a tRNA molecule and the box structure of an mRNA molecule. [2 marks] 1 2 0 1 . 4 In a eukaryotic cell, the structure of the mRNA used in translation is different from the structure of the pre-mRNA produced by transcription. Describe and explain a difference in the structure of these mRNA molecules. [2 ma [Show More]

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