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Carbohydrates and Lipids · Paper 1 — Free Biology HL Practice Questions

What this topic covers

This theme is built on one repeated argument: structure exists because it does a job, and you can predict the job from the structure. Examiners test this exact logic at every scale — a motor protein's shape tells you which way it walks a microtubule, a red blood cell's missing nucleus tells you why it can pack more haemoglobin, a gill's countercurrent geometry tells you why it out-performs a lung-style parallel flow. Several chunks here — muscle and motility, enzyme kinetics, endosymbiotic theory, detailed phloem loading — exist only on the HL paper, and they're flagged below. Get the mechanism words right (troponin, not tropomyosin; ATP-binding, not hydrolysis) because that's where the marks actually sit.

Read the full Form and Function lesson notes →

1FoundationMCQMetabolism of glucose1 markPaper 1~2 min

A patient has a mitochondrial disorder in which the enzyme complex that converts pyruvate to acetyl-CoA is non-functional. Which outcome is most likely in the affected cells compared to a healthy individual?

Solutions

2FoundationMCQMetabolism of glucose1 markPaper 1~2 min

Under anaerobic conditions, yeast cells oxidise glucose to pyruvate during glycolysis. Which statement correctly describes the subsequent fate of pyruvate and its metabolic significance in these cells?

Solutions

3MasteryMCQStructure and function of carbohydrates and lipids1 markPaper 1~2 min

A polysaccharide isolated from plant cell walls is hydrolysed by acid into identical monosaccharide monomers. The glycosidic bonds linking these monomers are oriented so that alternating monomers are inverted relative to each other. Which polysaccharide is this?

Solutions

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