MCAT Biochemistry Question 14: Answer and Explanation

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Question: 14

14. Which of the following is a reason for conjugating proteins?

I. To direct their delivery to a particular organelle

II. To direct their delivery to the cell membrane

III. To add a cofactor needed for their activity

  • A. I only
  • B. II only
  • C. II and III only
  • D. I, II, and III

Correct Answer: D

Explanation:

Conjugated proteins can have lipid or carbohydrate “tags” added to them. These tags can indicate that these proteins should be directed to the cell membrane (especially lipid tags) or to specific organelles (such as the lysosome). They can also provide the activity of the protein; for example, the heme group in hemoglobin is needed for it to bind oxygen. Thus, choice (D) is the correct answer.

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