8461-2H-QP-Biology-G-26Nov21-AM.pdf

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0 1 The nucleus of a cell contains DNA. 0 1 . 1 Name the structures inside the cell nucleus that contain DNA. [1 mark] Figure 1 shows part of a DNA molecule. Figure 1 0 1 . 2 Name the part of the... DNA molecule labelled X. [1 mark] 0 1 . 3 What type of substances are labelled A, C, G and T in Figure 1? [1 mark] Do not write outside the box 3 *03* Turn over ► IB/M/Jun21/8461/2H Do not write outside the Figure 2 shows another section of a DNA molecule. box Figure 2 Four of the substances you named in Question 01.3 are not labelled in part Y of Figure 2. Label each of these substances with the correct letter, A, C, G or T. Use information from other parts of Figure 2 to help you. [1 mark] 0 1 . 4 0 1 . 5 What is happening to the DNA in part Z of Figure 2? [1 mark] Tick () one box. Differentiation Evolution Fertilisation Replication 4 *04* IB/M/Jun21/8461/2H Do not write outside the box 8 0 1 . 6 A gene is a length of DNA. What type of substance does a gene code for? [1 mark] 0 1 . 7 Most human body cells contain 6 × 10–12 grams of DNA. What mass of DNA will a human sperm cell contain? [1 mark] Tick () one box. 6 × 10–6 grams 6 × 10–12 grams 3 × 10–6 grams 3 × 10–12 grams 0 1 . 8 What is the name of the type of cell division that produces sperm cells? [1 mark] Tick () one box. Binary fission Differentiation Meiosis Mitosis 5 *05* Turn over ► IB/M/Jun21/8461/2H Do not write outside the box 0 2 A student investigated the effect of temperature on the decay of milk. Figure 3 shows the apparatus the student used. Figure 3 This is the method used. 1. Set up the apparatus as shown in Figure 3 with the milk at 20 °C. 2. Record the pH over 5 days using the computer. 3. Repeat with another batch of fresh milk at 25 °C. 0 2 . 1 How could the student keep the milk at a constant temperature for 5 days? [1 mark] 0 2 . 2 Give one variable the student should keep constant. Do not refer to temperature in your answer. [1 mark] Question 2 continues on the next page 6 *06* IB/M/Jun21/8461/2H Do not write outside the box 8 Table 1 shows the student’s results for the milk at 20 °C. Table 1 Time in days 0 1 2 3 4 5 pH 6.7 6.7 6.3 5.3 4.6 4.4 0 2 . 3 Complete Figure 4. [4 marks] You should: • label the x-axis • use a suitable scale for the x-axis • plot the data from Table 1 • draw a line of best fit. Figure 4 0 2 . 4 The data you plotted in Question 02.3 were obtained at 20 °C. Sketch a line on Figure 4 to show the results you would expect at 25 °C. Label this line ‘25 °C’. [Show More]

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