L1 is an IgSF molecule that has been shown to be important in neural development; it is thought that it may be involved in axon growth within the embryonic nervous system. What evidence supports this statement?
A)L1 mutants always die.
B)L1 mutants show deficits in their vision.
C)People who die of L1-deficiency are often missing two large nerve tracts connecting brain/spinal cord regions.
D)People who die of L1-deficiency are often missing a significant portion of their brain.
E)People who die of L1-deficiency are often missing a significant portion of their spinal cord.

Question

Quizplus · Accepted Answer

The fact that people who die of L1-deficiency are often missing two large nerve tracts connecting brain/spinal cord regions provides evidence that L1 is involved in axon growth within the embryonic nervous system. This suggests that L1 may play a role in the development of these nerve tracts, and that mutations in L1 could disrupt this process. The other answer choices do not provide direct evidence for L1's involvement in neural development.

L1 Is an IgSF Molecule That Has Been Shown to Be