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Niacin: Quiz


Question 1: The liver can synthesize niacin from the essential ________ tryptophan, requiring 60 mg of tryptophan to make one mg of niacin.
MetabolismAmino acidAmino acid synthesisL-DOPA

Question 2: In larger doses, niacin can reverse atherosclerosis by lowering ________ (LDL) and favorably affecting other compounds.
CholesterolTrans fatHypertensionLow-density lipoprotein

Question 3: B6 (Pyridoxine, Pyridoxal phosphate, ________)
PimagedinePyridineCofactor (biochemistry)Pyridoxamine

Question 4: [35] The 5-membered ________ heterocycle of tryptophan is cleaved and rearranged with the alpha amino group of tryptophan into the 6-membered aromatic heterocycle of niacin.
Conjugated systemCovalent bondAromaticityChemical bond

Question 5:
What is Niacin also known as?
Pyrrolidine-2-carboxylic acid
6-Methyl- 9,10- didehydroergoline- 8-carboxylic acid
pyridine-3-carboxylic acid, nicotinic acid, vitamin B3
3-hydroxypentanedioic acid-3-carboxylic acid

Question 6: [3] Niacin is involved in both DNA repair, and the production of steroid hormones in the ________.
Adrenal glandEndocrine systemThyroidTesticle

Question 7: Maize is the only grain low in niacin, and ________ is needed to increase the bioavaiability of niacin during meal/flour production.
NutritionMaya cuisineNixtamalizationPellagra

Question 8: Niacin, also known as vitamin B3 or nicotinic acid, is an ________ with the formula C5H4NCO2H.
CarbonOrganic compoundOrganic chemistryBiochemistry

Question 9: [2] Niacin is a precursor to NADH, NAD+, NADP+ and NADPH, which play essential metabolic roles in ________.
Cell nucleusCell (biology)OrganelleMitochondrion

Question 10: This effect is mediated by prostaglandin and can be blocked by taking 300 mg of ________ half an hour before taking niacin, or by taking one tablet of ibuprofen per day.
DiclofenacEtodolacAspirinNon-steroidal anti-inflammatory drug

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