AS & A Level Biology (9700) — May–June 2023, Paper 42

Explain why glucose is phosphorylated at the beginning of glycolysis.

In sexual reproduction, meiosis occurs to produce haploid gametes from a diploid cell. Explain the meaning of the terms haploid and diploid.

A large sample of sea blush fruits was collected and their fruit-wing characteristic was recorded. Name the type of variation that is shown for the fruit-wing characteristic of…

Restriction endonucleases are used in genetic modification. These enzymes occur naturally in prokaryotic cells. More than 3500 different restriction endonucleases have been…

Use Hardy-Weinberg equation 1 and equation 2 to calculate the percentage of the population of rats on the island that is heterozygous for warfarin resistance. equation 1: p + q =…

Fig. 6.1 is a photomicrograph of a section through a Bowman's capsule and a glomerulus. On Fig. 6.1, use label lines and letters to label: F - the location of the glomerular…

A striated muscle cell (muscle fibre) will contract when stimulated by a motor neurone at a neuromuscular junction. Air temperature can affect the temperature of striated muscle…

In plants such as rice, Oryza sativa, rubisco has a low rate of activity, which in turn affects the rate of photosynthesis. The cereal crop sorghum, Sorghum bicolor, has a high…

The passage outlines the endocrine system. Complete the passage by using the most appropriate scientific terms. 'The endocrine system consists of tissues and .........., which…

Many zoos around the world are involved in captive breeding programmes for endangered species. Outline the role of zoos in the conservation of endangered species, other than…