MCAT Behavioral Sciences Question 7: Answer and Explanation
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Question: 7
7. Which of the following is/are true with regard to neurulation?
I. The neural tube differentiates from endoderm.
II. The neural tube becomes the peripheral nervous system.
III. Neural crest cells migrate from their original site.
- A. I only
- B. III only
- C. II and III only
- D. I, II, and III
Correct Answer: B
Explanation:
Neurulation occurs when the notochord causes differentiation of overlying ectoderm into the neural tube and neural crest cells. The neural tube ultimately becomes the central nervous system (brain and spinal cord), and neural crest cells migrate to other sites in the body to differentiate into a number of different tissues. Thus, only statement III is true.