There are twenty-one (21)tetrahedral carbons in Vitamin D4 (structure shown). 
Definitions:
Phobic Disorders
A category of anxiety disorders characterized by an excessive and irrational fear of specific objects, situations, or activities.
DSM-5
The fifth edition of the Diagnostic and Statistical Manual of Mental Disorders, a comprehensive classification of mental disorders used by healthcare professionals.
Anxiety Disorders
A group of mental health disorders characterized by excessive fear, anxiety, and related behavioral disturbances.
Excessive Apprehension
An overly intense worry or fear about future events or outcomes, beyond what may be considered normal or rationale.
Q17: When the peptide below is hydrolyzed with
Q32: Triacylglycerols are esters formed from glycerol and
Q38: Which nonsteroidal anti-inflammatory drug(s)(NSAID)is/are sold as a
Q54: What type of compound is shown below?
Q56: A _ is a peptide that contains
Q69: An individual can survive on a completely
Q69: The compound below is named N-methylcyclopentylamine. <img
Q74: Which compound has the highest boiling point?<br>A)BrCH<sub>2</sub>CH<sub>2</sub>CH<sub>2</sub>CH<sub>3</sub><br>B)FCH<sub>2</sub>CH<sub>2</sub>CH<sub>2</sub>CH<sub>2</sub>CH<sub>3</sub><br>C)FCH<sub>2</sub>CH<sub>2</sub>CH<sub>2</sub>CH<sub>3</sub><br>D)ClCH<sub>2</sub>CH<sub>2</sub>CH<sub>2</sub>CH<sub>2</sub>CH<sub>3</sub><br>E)ICH<sub>2</sub>CH<sub>2</sub>CH<sub>2</sub>CH<sub>2</sub>CH<sub>3</sub>
Q76: What is the name of the nucleoside
Q99: Ethambutol (structure shown)is a bacteriostatic antimycobacterial drug