2. Biological molecules
A section of Biology, 9700
Listing 10 of 748 questions
shows the structure of sucrose, a disaccharide produced by plant cells. CH2OH CH2OH H H HO OH H HOCH2 H OH H H H OH HO H O O O Name the covalent bond that joins the two monomers in sucrose. Sucrose is hydrolysed by the enzyme sucrase in the human digestive system. The products of this hydrolysis reaction are the monosaccharides α-glucose and fructose. Complete the diagram to show the hydrolysis of sucrose to form α-glucose and fructose. CH2OH CH2OH H H HO OH H HOCH2 H OH H H H OH HO H O O O Plants transport sucrose from a source to a sink. is a scanning electron micrograph (SEM) of a transverse section through a plant tissue used to transport sucrose. X Name the structure labelled X in . A scientist carried out an experiment to study carbohydrate transport in the stem of a woody plant. shows a plan diagram of a transverse section of the stem studied by the scientist. The position of the xylem tissue in the stem is shown. outer stem tissues xylem tissue pith The scientist carried out a set of experiments using plants of the same species. Sucrose is a sweet-tasting sugar found in many foods. Some people become ill when they have sucrose in their diet. These people have a gene mutation in the gene coding for sucrase and cannot hydrolyse sucrose in the digestive system. Scientists studying the DNA of people with this condition identified a deletion mutation in the gene coding for sucrase. Suggest and explain why a person with this deletion mutation cannot digest sucrose.
9700_w24_qp_21
THEORY
2024
Paper 2, Variant 1
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Questions Discovered
748