Tamoxifen Is a Drug Used to Prevent Recurrence of Certain

question 52

Multiple Choice

Tamoxifen is a drug used to prevent recurrence of certain types of breast cancers that require estrogen to grow. Tamoxifen binds to the active site of the estrogen receptor protein, preventing estrogen from binding to the enzyme. Once Tamoxifen binds to the protein, the protein is permanently deactivated. Which of the following descriptions best fits Tamoxifen?

• A) Tamoxifen is an irreversible, noncompetitive inhibitor.
• B) Tamoxifen is a reversible, noncompetitive inhibitor.
• C) Tamoxifen is an irreversible, competitive inhibitor.
• D) Tamoxifen is a reversible, competitive inhibitor.
• E) Tamoxifen is not an inhibitor.

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The introduction of contaminants into the natural environment, causing adverse change and harm to ecosystems and human health.

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A comprehensive federal law in the United States that regulates air emissions from stationary and mobile sources to control air pollution.

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