AS & A Level Biology (9700) — October–November 2023, Paper 42
10 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Some organisms carry out respiration in anaerobic conditions when oxygen is not available or in low concentration. In yeast and some plants this is called ethanol fermentation; in…
Answer this question and get it marked →Yeasts are unicellular organisms from the kingdom Fungi. Saccharomyces cerevisiae can carry out asexual reproduction by mitosis or sexual reproduction by meiosis, and exists as…
Answer this question and get it marked →Research suggests that selective breeding began about 10 000 years ago and has been important in satisfying the global demand for food. The introduction of disease resistance to…
Answer this question and get it marked →A marker gene can be used when a gene of interest is introduced into a plant by genetic engineering. Describe and explain how the use of a marker gene coding for a fluorescent…
Answer this question and get it marked →The fruit fly, Drosophila melanogaster, has autosomal genes for body colour and wing shape. Gene B/b: B = dominant allele for brown body colour, b = recessive allele for black…
Answer this question and get it marked →When blood glucose concentration decreases, glucagon is released by the pancreas into the blood and transported to the cells. Fig. 6.1 outlines the effect of glucagon on liver…
Answer this question and get it marked →There are many mitochondria located in the presynaptic knobs of neuromuscular junctions and in the sarcomeres of muscle fibres of striated muscle. Explain the need for many…
Answer this question and get it marked →Non-cyclic photophosphorylation occurs in the light-dependent stage of photosynthesis. Outline the main features of non-cyclic photophosphorylation.
Answer this question and get it marked →Antidiuretic hormone (ADH) is involved in the maintenance of a constant blood water potential. A student drank 0.5 dm³ of water and the concentration of ADH in their blood was…
Answer this question and get it marked →Complete the passage by using the most appropriate scientific terms: 'The size of a population of animals can be estimated using the mark-release-recapture method. A sample of…
Answer this question and get it marked →← October–November 2023 Paper 43 · October–November 2023 Paper 41 →