AQA AS BIOLOGY 7401/2 Paper 2 Version: 1.0 Final *JUN*QUESTION PAPER & MARKING SCHEME/ [MERGED] Mark scheme June 2023

AQA AS BIOLOGY 7401/2 Paper 2 Version: 1.0 Final *JUN* IB/M/Jun23/E9 7401/2 For Examiner’s Use Question Mark 1 2 3 4 5 6 7 8 9 10 TOTAL Thursday 25 May 2023 Morning 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 of this 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 2 2 *02* IB/M/Jun23/7401/2 Do not write outside the Answer all questions in the spaces provided. box 0 1 . 1 Which statement about the function of ribosomes is correct? Tick () one box. [1 mark] Site of transcription, catalyse the joining of amino acids by hydrolysis reactions Site of transcription, catalyse the joining of nucleotides by condensation reactions Site of translation, catalyse the joining of amino acids by condensation reactions Site of translation, catalyse the joining of nucleotides by hydrolysis reactions 0 1 . 2 Name two biological molecules that can be coded for by a gene. Do not include a polypeptide or protein in your answer. [1 mark] 1 2 3 *03* Turn over ► IB/M/Jun23/7401/2 Do not write outside the box 0 1 . 3 Scientists investigated the structure of the endoplasmic reticulum. Table 1 shows some of the scientists’ results. Table 1 Type of endoplasmic reticulum Percentage of endoplasmic reticulum made of phospholipids Rough 46.8 Smooth 52.5 Use the data in Table 1 to suggest how the structure of rough endoplasmic reticulum is different from the structure of smooth endoplasmic reticulum and how this is related to their functions. [3 marks] Turn over for the next question 5 4 *04* IB/M/Jun23/7401/2 Do not write outside the box 0 2 . 1 Figure 1 shows an ATP synthase enzyme in the inner mitochondrial membrane. Figure 1 Complete the passage with the appropriate terms. [2 marks] ATP synthase comprises several polypeptides, so is said to have a structure. It catalyses the synthesis of an ATP molecule by a reaction; this involves the of a water molecule. The ATP synthase in Figure 1 is in a mitochondrion so would catalyse reactions during . 5 *05* Turn over ► IB/M/Jun23/7401/2 Do not write outside the box 6 0 2 . 2 As shown in Figure 1, ATP synthase has two funct