Multiple Choice
Which is the best definition of binding energy regarding enzyme catalysis?
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6. Enzymes and Enzyme Kinetics
Enzyme-Substrate Complex
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Which of the following incorrectly pairs the enzyme with the molecule on which it acts?
A
Amylase — Starch
B
Lipase — Triglyceride
C
Lactase — Sucrose
D
Pepsin — Protein
Verified step by step guidance1
Step 1: Understand the role of enzymes in biochemical reactions. Enzymes are biological catalysts that speed up reactions by acting on specific substrates. Each enzyme is highly specific to its substrate, meaning it interacts with a particular molecule to facilitate its breakdown or transformation.
Step 2: Analyze the enzyme-substrate pairs provided in the question. For example, amylase acts on starch to break it down into simpler sugars, lipase acts on triglycerides to break them into glycerol and fatty acids, and pepsin acts on proteins to break them into smaller peptides.
Step 3: Examine the pair 'Lactase — Sucrose.' Lactase is an enzyme that specifically acts on lactose, a disaccharide found in milk, breaking it into glucose and galactose. Sucrose, on the other hand, is a different disaccharide composed of glucose and fructose, and lactase does not act on sucrose.
Step 4: Identify the incorrect pairing. Since lactase does not act on sucrose, the pair 'Lactase — Sucrose' is incorrect. This is because lactase is specific to lactose, not sucrose.
Step 5: Conclude that the correct answer to the question is 'Lactase — Sucrose,' as it is the incorrectly paired enzyme-substrate combination.
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