Question

1 multiple choice 2 points the diagram below shows an enzyme - substrate complex. which is true about the enzyme - substrate complex? structure x is the enzyme and structure y is the substrate. structure y is the enzyme and structure x is the substrate. structure z is the enzyme and structure y is the substrate.

Explanation:

Enzymes are biological catalysts that bind to substrates (reactants) and facilitate reactions. Enzymes are typically larger, have a specific active site, and are not consumed in the reaction (their structure remains largely the same before and after the reaction). In the diagram, Structure Y remains relatively unchanged through the steps (Step 1 to Step 3), while Structure X binds to Y (Step 1), reacts (Step 2), and then a new structure (Structure Z) is formed (product) and Y is free again. So Structure Y is the enzyme (unchanged catalyst) and Structure X is the substrate (reactant that binds to enzyme). The third option is incorrect as Structure Z is a product, not the enzyme. The first option is incorrect as X is the substrate (changes), Y is the enzyme (unchanged).

Answer:

B. Structure Y is the enzyme and Structure X is the substrate (assuming the options are labeled as first: A, second: B, third: C; if original labels differ, adjust, but based on content, the correct statement is "Structure Y is the enzyme and Structure X is the substrate").