Biology > QUESTION PAPER & MARK SCHEME > AQA AS BIOLOGY 7401/1 Paper 1 Question Paper + Mark scheme (Merged) GRADE A+ (All)

AQA AS BIOLOGY 7401/1 Paper 1 Question Paper + Mark scheme (Merged) GRADE A+

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AQA AS BIOLOGY 7401/1 Paper 1 Question Paper + Mark scheme (Merged) June 2021 Version: 1.0 Final *JUN217401101* IB/M/Jun21/E17 7401/1 For Examiner’s Use Question Mark 1 2 3 4 5 6 7... 8 9 TOTAL Time allowed: 1 hour 30 minutes Materials For this paper you must have: •a ruler with millimetre measurements •a scientific calculator. Instructions •Use black ink or black ball-point pen. •Fill in the boxes at the top of this page. •Answer all questions. •You must answer the questions in the spaces provided. Do not write outside the box around each page or on blank pages. •If you need extra space for your answer(s), use the lined pages at the end ofthis book. Write the question number against your answer(s). •Show all your working. •Do all rough work in this book. Cross through any work you do not want to be marked. Information •The marks for the questions are shown in brackets. •The maximum mark for this paper is 75. Please write clearly in block capitals. Centre number Candidate number Surname Forename(s) Candidate signature I declare this is my own work. AS BIOLOGY Paper 1 2 *02* IB/M/Jun21/7401/1 Do not write outside the box Answer all questions in the spaces provided. 0 1 Figure 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 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 3 *03* Turn over ► IB/M/Jun21/7401/1 Do not write outside the box 0 1 . 3 Describe two differences between the structure of a tRNA molecule and the 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 marks] [Show More]

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