Fig. 4.1 shows the structure of sucrose, a disaccharide produced by plant cells. Fig. 4.1 (i) Name the covalent bond that joins the two monomers in sucrose. (i) Na ................................................................................................................................. (ii) Sucrose is hydrolysed by the enzyme sucrase in the human digestive system. The products of this hydrolysis reaction are the monosaccharides $$$\alpha$$$-glucose and fructose. Complete the diagram to show the hydrolysis of sucrose to form $$$\alpha$$$-glucose and fructose.

Biology

IGCSE&ALevel

CAIE

Exam No：9700_w24_qp_21 Year：2024 Question No：4(a)

Answer:

Knowledge points:

2.2.1 describe the ring forms of α-glucose and β-glucose

2.2.10 relate the molecular structure of triglycerides to their functions in living organisms

2.2.11 describe the molecular structure of phospholipids with reference to their hydrophilic (polar) phosphate heads and hydrophobic (non-polar) fatty acid tails

2.2.2 define the terms monomer, polymer, macromolecule, monosaccharide, disaccharide and polysaccharide

2.2.3 describe the formation of a glycosidic bond by condensation, with reference both to polysaccharides and to disaccharides, including sucrose

2.2.4 state that glucose, fructose and maltose are reducing sugars and that sucrose is a non-reducing sugar

2.2.5 describe the formation of a glycosidic bond by condensation, with reference to disaccharides, including sucrose, and polysaccharides

2.2.6 describe the breakage of a glycosidic bond in polysaccharides and disaccharides by hydrolysis, with reference to the non-reducing sugar test

2.2.7 describe the molecular structure of the polysaccharides starch (amylose and amylopectin) and glycogen and relate their structures to their functions in living organisms

2.2.8 describe the molecular structure of the polysaccharide cellulose and outline how the arrangement of cellulose molecules contributes to the function of plant cell walls

2.2.9 state that triglycerides are non-polar hydrophobic molecules and describe the molecular structure of triglycerides with reference to fatty acids (saturated and unsaturated), glycerol and the formation of ester bonds

Answer:

Knowledge points:

Solution:

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