Umiejętności z tego działu sprawdza 61 zadań wzorowanych na arkuszach IB z lat 2022–2026. Dział pojawia się w 35 z 54 arkuszy w bazie.
An enzyme catalyses the assembly of a larger molecule from smaller reactants. Which energy profile is consistent with an anabolic reaction that still has an activation barrier? R and P indicate the reactant and product ends of each curve. A. Profile A B.…
Which account describes induced fit when an enzyme encounters its substrate? A. The substrate is permanently fixed in space before any enzyme can approach B. Binding changes the shape of the active site and can strain the substrate towards reaction C. The…
A dashed curve shows enzyme activity without an inhibitor. Which solid curve is expected after adding a reversible non-competitive inhibitor at a fixed concentration? A. Curve A B. Curve B C. Curve C D. Curve D
A soluble enzyme from a mesophilic organism is tested from near freezing to temperatures that denature it. Substrate is abundant. Which graph best represents its initial activity across this range? A. Graph A B. Graph B C. Graph C D. Graph D
Statins are used to reduce the synthesis of cholesterol by inhibiting HMG-CoA reductase. Which account identifies their inhibition mechanism and binding location? A. Irreversible inhibition through destruction of the enzyme B. Competitive inhibition through…
Outline how the enzyme’s reaction rate could be calculated from suitable measurements.
Distinguish between competitive inhibition and pure non-competitive inhibition.
(i) Identify both independent variables. (ii) Outline how assay temperature could be held constant. (iii) Explain why the concentration of ATP synthase must be the same in all assays.
Discuss two variables that should be controlled in this investigation.
Distinguish a cyclic metabolic pathway from a linear metabolic pathway.
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