A Series of Enzymes Catalyze the Reaction X → Y

question 66

Multiple Choice

A series of enzymes catalyze the reaction X → Y → Z → A. Product A binds to the enzyme that converts X to Y at a position remote from its active site. This binding decreases the activity of the enzyme.
-With respect to the enzyme that converts X to Y, substance A functions as

• A) a coenzyme.
• B) an allosteric inhibitor.
• C) the substrate.
• D) an intermediate.
• E) a competitive inhibitor.

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Definitions:

Spending Variance

The difference between the actual amount spent and the budgeted amount for a particular period or item.

Actual Level

The real, measured level of production, performance, or activity, as opposed to planned or theoretical levels.

Spending Variance

The difference between the actual amount spent and the budgeted amount for a particular category or period, indicating over or under spending.

Planning Budget

A financial plan that estimates the revenue and expenses for a specific period, often used for setting performance expectations.