A-LevelBiologyBiological moleculesFeb/Mar 2017Paper 1 Q121 Mark
Which row gives the correct description of both a collagen molecule and a collagen fibre? [Table 12.1]
Aα and β polypeptide chains forming a double helix, held together by disulfide bonds molecules of collagen arranged randomly to each other, linked by hydrogen bonds
Bpolypeptide chain, with repeating amino acids, forming an α-helix three molecules of collagen, forming a triple helix, held together by hydrogen bonds
Cpolypeptide chain, with three repeating amino acids, forming a helix three α helical collagen molecules, forming a triple helix, held together by ionic bonds
Dthree helical polypeptide chains, forming a triple helix, held together by hydrogen bonds molecules of collagen lying parallel and cross-linked to each other
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The correct answer is D. This question tests the candidate's understanding of biological molecules within the Biologysyllabus. The examiner's mark scheme requires...
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Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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