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AS BIOLOGY (7401 1) PAPER 1 SPECIMEN 2024 TEST WITH COMPLETE SOLUTIONS
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AS BIOLOGY (7401 1) PAPER 1 SPECIMEN 2024 TEST WITH COMPLETE SOLUTIONS
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AS BIOLOGY (7401/1) PAPER 1 SPECIMEN 2024 TEST WITHCOMPLETE SOLUTIONS
01 . 1) Describe how you could use cell fractionation to isolate chloroplasts from leaf
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tissue. [3 marks] - correct answer-1. How to break open cells and remove debris;
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2. Solution is cold/isotonic/buffered;
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3. Second pellet is chloroplast;
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01 . 2) (Figure 1 shows a photograph of a chloroplast taken with an electron
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microscope.
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Figure 1) n
Name the parts of the chloroplast labelled A and B.
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n[2 marks] - correct answer-1. A stroma;
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2. B granum;
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01 . 3) Calculate the length of the chloroplast shown in Figure 1.
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n[1 mark] - correct answer-(length of chloroplast/length of bar)um
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01 . 4) Name two structures in a eukaryotic cell that cannot be identified using an
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noptical
microscope.
n[1 mark] - correct answer-Mitochondrion/ribosome/endoplasmic
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reticulum/lysosome/cell-surface membrane n
02 . 1) A technician investigated the effect of temperature on the rate of an enzyme-
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controlled
reaction. At each temperature, he started the reaction using the same volume of
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substrate solution and the same volume of enzyme solution.
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Figure 2 shows his results.
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, Give one other factor the technician would have controlled.
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n[1 mark] - correct answer-Concentration of substrate solution / of enzyme
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solution / pH; n n
02 . 2) Calculate the rate of reaction at 25 C.
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n [2 marks] - correct answer-1. 2.5/0.04;
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2. g dm-3 minute-1 / g dm-3 s-1
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;
02 . 3) Describe and explain the differences between the two curves.
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n[5 marks] - correct answer-1. Initial rate of reaction faster at 37 °C;
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2. Because more kinetic energy;
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3. So more E-S collisions/more E-S complexes
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formed;
4. Graph reaches plateau at 37 °C;
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5. Because all substrate used up;
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03 . 1) Figure 3 summarises the process of meiosis. The circles represent cells and
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the
n
structures within each cell represent chromosomes.
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Describe and explain the appearance of one of the chromosomes in cell X.
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n[3 marks] - correct answer-1. Chromosome is formed of two chromatids;
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2. (Because) DNA replication (has occurred);
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3. (Sister) chromatids held together by
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centromere;
03 . 2) Describe what has happened during division 1 in Figure 3.
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n[2 marks] - correct answer-1. Chromosomes in homologous pair;
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2. One of each into daughter cells / haploid
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number;
03 . 3) Identify one event that occurred during division 2 but not during division 1.
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n[1 mark] - correct answer-Separation of (sister) chromatids / division of
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centromere;
03 . 4) Name two ways in which meiosis produces genetic variation.
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n[2 marks] - correct answer-1. Independent segregation (of homologous
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chromosomes);
2. Crossing over / formation of chiasmata;
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04 . 1) Figure 4 shows one base pair of a DNA molecule.
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Name part F of each nucleotide.
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[1 mark] - correct answer-Deoxyribose;
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04 . 2) Scientists determined that a sample of DNA contained 18% adenine.
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What were the percentages of thymine and guanine in this sample of DNA?
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n[2 marks] - correct answer-1. Thymine 18(%);
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