AS & A Level Biology (9700) — May–June 2024, Paper 41
10 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Oxygen is needed for aerobic respiration in cells. In eukaryotic cells, the mitochondrion is the organelle used for aerobic respiration. Fig. 1.1 shows a transmission electron…
Answer this question and get it marked →Coordination in humans involves two main systems: the nervous system and the endocrine system. Paracrine cell signalling is a third way in which coordination occurs. In paracrine…
Answer this question and get it marked →Stomata in leaves respond to changes in environmental conditions by opening and closing. This regulates carbon dioxide uptake and water loss. Describe the mechanism by which…
Answer this question and get it marked →White-clawed crayfish, Austropotamobius pallipes, live in rivers and lakes in Europe. In the 1850s, the North American signal crayfish, Pacifastacus leniusculus, was introduced to…
Answer this question and get it marked →Photosynthesis is the energy transfer process that occurs in chloroplasts. Fig. 5.1 shows some biochemical events that occur in a chloroplast during the light-dependent stage of…
Answer this question and get it marked →Many different genes are involved in the production of pigments in mammals. One example is the TYR gene. In humans the TYR gene is located on chromosome 11. Fig. 6.1 shows the…
Answer this question and get it marked →It has been hypothesised that the mutation rate of an animal species may affect how fast animals of that species age and how long they live (lifespan). Table 7.1 compares the…
Answer this question and get it marked →Bears are several species of mammal in the family Ursidae. Climate change and loss of habitats due to human activity have reduced the size of some bear populations in recent…
Answer this question and get it marked →The harlequin ladybird, Harmonia axyridis, is an insect that shows discontinuous variation in colour pattern and continuous variation in body size. Within a species, the variation…
Answer this question and get it marked →Humans detect the sweet taste of sucrose sugar using chemoreceptor cells in taste buds on the tongue. The red admiral butterfly, Vanessa atalanta, detects sucrose using…
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