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Proteins · Paper 1 — Free Biology SL Practice Questions

1FoundationMCQEnzymes as biological catalysts1 markPaper 1~2 min
In the metabolic pathway A→Enzyme 1B→Enzyme 2CA \xrightarrow{\text{Enzyme 1}} B \xrightarrow{\text{Enzyme 2}} C, a non-competitive inhibitor binds to Enzyme 2. Which molecule shows the most immediate increase in concentration?
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Solutions

2MasteryMCQStructure of proteins: Primary to quaternary structure1 markPaper 1~2 min
A purified enzyme from a thermophilic bacterium is treated with a reducing agent that cleaves disulfide bonds between cysteine residues within a single polypeptide chain. The amino acid sequence remains unchanged, but the enzyme loses its three-dimensional shape and catalytic activity. Which level of protein structure is most directly disrupted?
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Solutions

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