A Biochemist Generates an Enzyme Activity Curve for an Unknown

question 164

Multiple Choice

A biochemist generates an enzyme activity curve for an unknown enzyme.The curve is shown below. Which statement best explains the shape of this curve?

• A) The enzyme has multiple active sites. As the enzyme binds substrate at one site, its affinity for binding substrate at other active sites increases.
• B) The enzyme has a single active site. As the enzyme binds substrate, the activity of the enzyme stalls until it can clear the active site.
• C) The enzyme has multiple active sites. As the substrate concentration increases, all sites must be equally bound for the reaction to proceed.
• D) The enzyme has multiple active sites. Substrate binding at each of the sites is dependent upon the temperature of the reaction.
• E) The enzyme has a single active site. Substrate binding at this particular site occurs within a narrow pH range, termed the equivalence point.

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Definitions:

Economic Decisions

The choices made by individuals, businesses, governments, and other groups that affect the allocation of resources and the distribution of goods and services.

Excess Burdens

The economic inefficiencies that result from implementing a tax, often causing changes in consumption and production behaviors that lead to a loss in social welfare.

Nonneutral Taxes

Taxes that affect economic choices, potentially leading to inefficiencies or changes in market behavior, unlike neutral taxes which do not alter decision-making.

Externalities

Effects of a production or consumption activity on other parties not directly involved in the transaction, which may be either positive or negative.