Answer Key: MCQ on Vitamins

MCQ on Vitamins Retinol is oxidized to: a. all trans retinal b. 11-cis retinol c. retinoic acid d. rhodopsin The major storage form of vitamin D is: a. 7. dehydrochlesterol b. vitamin D₂ c. 25-OH-D₃ d. 24-04-D₂ Is the inhibitor of vitamin K? a. avidin b. globulin c. warfarin d. glutamate e. clotting factor II One of the following is the inhibitor of THF? a. alcohol b. methanol c. methotrexate d. aminobenzoic acid e. methane The adenosylcobalamine is involved in the synthesis of: a. acetyl CoA b. succinyl CoA c. methionine d. malanyl CoA e. homocysteine The deficiency of cobalamine causes: a. sickle cell anemia b. hemolytic anemia c. pernicious anemia d. β-thalassemia e. Jaundice Ascorbic acid is involved in all the following except: a. absorption of iron from the intestine. b. the hydroxylation of proline & lysine c. required for bile acid d. required for the synthesis of epinephrine e. as a coenzyme for transketolase Is the inhibitor of biotin? a. globulin b. avidin c. opsin d. albumin e. elastin Retinol is oxidized to: a. all trans retinal b. 11-cis retinol c. retinoic acid d. rhodopsin e. retinal The inhibitor of vitamin K? a. avidin b. globulin c. warfarin d. glutamate e. clotting factor The active form of vitamin E: a. α-Tocopherol b. β-Tocopherol c. phylloquinone d. menadione e. THF Newborn infants are more likely to have deficiency of: a. Thiamin b. vitamin K c. folic acid d. vitamin E Bile salts are important for the absorption of the following: a. retinol b. α-tocopherols c. thiamine d. cholecalciferol All of the following are true about water-soluble vitamins except: a. they are polar b. must be provided regularly c. bile salts are not needed for their absorption d. members of B-complex are of similar chemical structure All of the following are true about fat-soluble vitamins: a. they are hydrophobic b. must be provided regularly c. their structure has isoprene units d. bile salts are needed for their absorption Which of the following does not occur in fat soluble a. can be stored in tissues as liver or adipose tissues or b. toxic concentrations can be accumulated c. the deficiency symptoms appear later d. Can be easily excreted in urine Metarhodopsin II plays an important direct role in the cycle because: a. it increases the number of the retinal receptors. b. it increases the intracellular cGMP. c. it activates guanylyl cyclase. d. it activates the G protein transducin. Rhodopsin contains opsin &: a. 11-cis retinal b. 11-trans retinal c. all cis retinal d. all trans retinal Retinoic acid can: a. act as a photo receptor b. support growth & differentiation c. act as an anti-oxidant d. act as an anti coagulant Provitamin D₃ is: a. ergocalciferol b. cholecalciferol c. ergosterol d. 7-dehydrocholesterol Calcification of soft tissues can occur in: a. hypovitaminosis D b. osteomalacia c. rickets d. hypervitaminosis D 25-hydroxylation of vitamin D occurs in: a. intestinal mucosa b. skin c. liver d. kidneys Vitamin A deficiency leads to all the following except: a. exophthalmia b. night blindness c. xerophthalmia d. dark adaptation prolonged Which of the following vitamins is not involved in the bone formation, growth & ossification? a. vitamin D b. vitamin C c. vitamin K d. vitamin E Thiamin deficiency can cause the following diseases except: a. wernicke’s encephalopathy b. dry beri beri c. wet beri beri d. burning foot syndrome Key answers A C C C B E C E B E C B C D B D D A B D D C A D D MCQs on water & PH Water has high boiling point because of: a. ionic bond b. covalent bond c. hydrogen bond d. nitrogen bond Physiological PH of blood is: a. 7.2 b. 7.4 c. 7.7 d. 7.6