1-Naturally occurring ligands, that after binding to receptor, activate signal transduction, are: Select one: A. Physiol

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1-Naturally occurring ligands, that after binding to receptor, activate signal transduction, are:
Select one:
A. Physiological antagonists
B. Physiological agonints
C. Pharmacological agonists
D. Pharmacological antagonists
2-Which of the following enzymes is the main regulatory enzyme of glycolysis in the brain?
Select one:
a. Phosphofructokinase
b. Enolase
C. Phosphoglycerate kinase
d. Aldolase
3-Unmyelinated parts of the axon are called:
Select one:
a. Periaxonal spaces
D. Internodes
c. Schmidt-Lanterman clefts
d. Nodes of Ranvier