In the rod cells of the eye,retinol (vitamin
A)can be oxidized and then isomerized into an aldehyde and a cis double bond at C-11 to form a molecule called 11Z-retinal.Propose a structure for 11Z-retinal. 
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Q26: What is the precursor of bile acids?
A)phosphoglyceride
B)acetyl
Q27: In nature,biosynthesis of cholesterol starts from
A)phosphoglyceride.
B)amino acids.
C)squalene.
D)prostaglandin.
E)steroid
Q28: Squalene is a
A)monoterpene.
B)sesquiterpene.
C)diterpene.
D)triterpene.
E)carotenoid.
Q29: The following molecule represents a 
Q30: Provide the structure of α-farnesene,a simple,acyclic sesquiterpene.
Q32: β-carotene is a
A)monoterpene.
B)sesquiterpene.
C)diterpene.
D)triterpene.
E)tetraterpene.
Q33: Propose a mechanism for the reaction,of dimethylallyl
Q34: Circle the isoprene units present in menthol
Q35: Lycopene is a
A)monoterpene.
B)sesquiterpene.
C)diterpene.
D)triterpene.
E)tetraterpene.
Q36: Which of the following is involved in
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