MCAT Biochemistry Question 15: Answer and Explanation
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Question: 15
15. Collagen consists of three helices with carbon backbones that are tightly wrapped around one another in a "triple helix." Which of these amino acids is most likely to be found in the highest concentration in collagen?
- A. Proline
- B. Glycine
- C. Threonine
- D. Cysteine
Correct Answer: B
Explanation:
Because collagen has a triple helix, the carbon backbones are very close together. Thus, steric hindrance is a potential problem. To reduce that hindrance, we need small side chains; glycine has the smallest side chain of all: a hydrogen atom.