Vitamin C, Thiamin and Niacin quiz Flashcards
Which water-soluble vitamin contributes to “intracellular cement” in the formation of scar tissue and wound healing?
Vitamin C
True or False. An example of a cleavage reaction requiring PLP is the degradation of thiamin into its pyrimidine and thiazole moieties.
False
An example is the removal of the hydroxymethyl group from serine.
The best sources of niacin are ____.
Fish and meat
In what way are water-soluble vitamins absorbed?
Into the portal blood
When ascorbic acid becomes dehydroascorbic acid, it has ____.
Two electrons lost
Without enough vitamin C, collagen would ____.
Underhydroxylated
Beriberi is a deficiency syndrome associated with ____.
Vitamin B1
Which classical vitamin deficiency is known for the four Ds: dermatitis, dementia, diarrhea, and death?
Niacin
A primary function of vitamin C is to act as an ____.
Antioxidant
Thiamin is important to fatty acid synthesis due to its requirement as a coenzyme for the pentose phosphate pathway enzyme ____.
transketolase
When water-soluble vitamins are consumed in excess of body needs, generally the excess is ____.
Excreted in urine
True or False. Large doses of nicotinic acid are used to treat certain types of hyperlipidemias.
True
A major role for thiamin is ____.
Energy production
When the diet is adequate in protein, the body can synthesize niacin from which amino acid?
tryptophan
Most animals synthesize their own ascorbic acid from ____.
Glucose
