Tamoxifen is a drug used to prevent the recurrence of certai…

Tamoxifen is a drug used to prevent the 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 descriptions BEST fits Tamoxifen?

Cholesterol is shown below, on the left. To the right are tw…

Cholesterol is shown below, on the left. To the right are two derivatives of cholesterol: cholic acid and vitamin D3. Which of the statements below best describe how cholesterol must be modified to become cholic acid and vitamin D3? ​ To make cholic acid from cholesterol… To make vitamin D3 from cholesterol… a. cholesterol must be oxidized to become more polar. ring B of the steroid skeleton is broken. b. cholesterol must be reduced to become more polar. more carbons must be added to cholesterol. c. cholesterol must be oxidized to become more polar. more carbons must be added to cholesterol. d. cholesterol must be reduced to become more polar. ring B of the steroid skeleton is broken. e. cholesterol must be reduced to become more nonpolar. ring B of the steroid skeleton is broken.