Q.All are true regarding molecular signaling in neurulation except
a. Hensen's
node secretes molecules that lead to neural induction.
b. Noggin, follistatin, and chordin are neural
inducers
d. the
notochord secretes the signaling
molecule sonic hedgehog (SHH)
e. Floor
plate produces SHH and the winged helix transcription factor hepatocyte nuclear
factor (HNF)-3β
ANS.---c
The ventral mesoderm and
the early ectoderm itself produce BMPs, especially BMP-4, which inhibit formation
of neural ectoderm and promote differentiation of epidermal ectoderm.
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