Biology > AQA A/As Level Question Paper > AQA AS BIOLOGY Paper 1 QP 2021 (All)
AQA AS BIOLOGY Paper 1 QP 2021
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Answer all questions in the spaces provided. box Figure 1 shows part of a DNA molecule. Figure 1 . Name the type of bond between: [2 marks] complementary base pairs adjacent nucleotides in a DNA ... strand . The length of a gene is described 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 nm 0 1 0 1 0 1 3 Do not write outside the *03* IB/M/Jun21/7401/1 3 4 . Describe two differences between the structure of a tRNA molecule and the structure of an mRNA molecule. box [2 marks] 1 2 . 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 [Show More]
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