AQA GCSE SCIENCE BIOLOGY 2020 PAPER 2 QP

Monday 1 June 2020 Afternoon Time allowed: 1 hour 15 minutes Materials For this paper you must have: • a ruler • a scientific calculator. Instructions • Use black ink or black ball-point pen. • Pencil should only be used for drawing. • Fill in the boxes at the top of this page. • Answer all questions in the spaces provided. • 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). • Do all rough work in this book. Cross through any work you do not want to be marked. • In all calculations, show clearly how you work out your answer. Information • The maximum mark for this paper is 70. • The marks for questions are shown in brackets. • You are expected to use a calculator where appropriate. • You are reminded of the need for good English and clear presentation in your answers. Please write clearly in block capitals. Centre number Candidate number Surname Forename(s) Candidate signature I declare this is my own work. GCSE COMBINED SCIENCE: TRILOGY Higher Tier Biology Paper 2H H 2 *02* IB/M/Jun20/8464/B/2H 0 1 This question is about DNA and genes. 0 1 . 1 Which diagram represents a DNA molecule? [1 mark] Tick () one box. 0 1 . 2 Describe the structure of a DNA molecule. [1 mark] 0 1 . 3 A gene is a small section of DNA on a chromosome. Complete the sentences. [2 marks] A gene codes for a particular sequence of . This sequence makes a specific . Do not write outside the box Double stranded helix polymer DNA 3 *03* Turn over ► IB/M/Jun20/8464/B/2H Do not write outside the box 0 1 . 4 What is meant by the term genome? [1 mark] 0 1 . 5 The complete human genome is now known. Which important scientific advance was made using knowledge of the human genome? [1 mark] Tick () one box. Discovering antibiotic resistant bacteria Finding more foods to eat from tropical forests Tracing how aboriginal people spread across Australia Working out when the last ice age ended Question 1 continues on the next page genetic material of an organism 4 *04* IB/M/Jun20/8464/B/2H Do not write outside the box 9 A student found six different snails of one species in his garden. Figure 1 shows the snails. Figure 1 0 1 . 6 All the snails are different. What scientific term describes differences in characteristics between individuals of a