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OCR AS LEVEL JUNE 2022 BIOLOGY B PAPER 1,2 AND INSERT QUESTION PAPER

1 The graph below shows the results of an osmosis experiment investigating the effect of changing the concentration of sodium chloride (NaCl) on mass of potatoes. Which concentration of NaCl causes e... qual movement of water into and out of the potato? A 0.36 mol dm–3 B 0.40 mol dm–3 C 0.42 mol dm–3 D 0.62 mol dm–3Your answer3 2 The reaction between carbon dioxide and water forms carbonic acid. This reaction is catalysed by the enzyme carbonic anhydrase. To catalyse this reaction, carbonic anhydrase needs a cofactor that attaches to its active site as a prosthetic group. What is the correct cofactor for carbonic anhydrase? A Ca2+B Cl –C H+D Zn2+Your answer [1] 3The table shows the numbers of different species of invertebrates found in four different areas in a woodland.Area Invertebrate species Woodlice Spiders Beetles Millipedes A 15 20 1 0 B 2 7 6 7 C 25 1 7 3 D 8 0 2 17 Which row shows the area that has the greatest species richness and greatest species evenness? Your answer 1 Fig. 1.1 shows a prepared slide of onion cells in different stages of mitosis, viewed using a light microscope. (ii) Fig. 1.2 shows a student’s drawing of the cell labelled C in Fig. 1. Give two improvements the student could make to their drawing 2 Lenticels appear as small brown patches on the surface of some fruit. A researcher wanted to investigate if water availability affected the number of lenticels on the surface of apples. They chose nine apple trees of one variety and watered each tree with a specific volume of water every day for twelve weeks. After twelve weeks they counted the total number of lenticels that developed on the surface of one apple from each tree. This was repeated with a second variety of apple. Fig. 2.1 shows the number of lenticels found on the surface of the two varieties Fetus G Fetus H Fetal Growth Chart: Weight Fetal Growth Chart: Length and Head Circumference [Show More]

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