2.Which vitamin can be synthesized in significant amounts by humans and, therefo

Question

2.Which vitamin can be synthesized in significant amounts by humans and, therefore, may NOT be essential?

retinoids

vitamin K

carotenoids

vitamin E

vitamin D

3.Fat-soluble vitamins are mainly stored in:

skeletal muscles and liver.

the gallbladder.

skeletal muscles and fatty tissues.

fatty tissues and liver.

the gallbladder and liver.

4. Which MUST be present for fat-soluble vitamins to be absorbed?

calcium and intrinsic factor

dietary lipids and LDL

dietary lipids and insulin

dietary lipids and bile calcium and LDL

5. An early sign of vitamin A deficiency is:

hypervitaminosis A.

night blindness.

keratinization.

infectious diseases.

carotenemia.

6. _____ is used to synthesize vitamin D when human skin is exposed to UV radiation.

Cholesterol

Melanin

Calcitriol

Cortisol

Tocopherol

7. The visual pigment rhodopsin is made of _____ and _____.

opsin; retinol

opsin; beta-carotene

opsin; retinoic acid

opsin; retinal

opsin; xanthophyll

8. Which vitamin is particularly effective at preventing free-radical damage to cell membranes?

carotenoids

vitamin K

vitamin A

vitamin D

vitamin E

9. Consumption of 300 mg tryptophan can result in the synthesis of _____ mg of niacin.

3

5

2

4

1

10.Which list contains ONLY vitamins whose deficiency can cause anemia?

vitamin B6, vitamin B12, thiamin

vitamin B6, vitamin B12, folate

vitamin B6, vitamin B12, niacin

biotin, vitamin B12, folate

vitamin B6, folate, retinoids, vitamin K

Explanation / Answer

3.    fat soluble vitamins are mainly stored in liver and fatty tissues.

       the liver cells are rich in certain fat soluble vitamins.

                                                                                                examples for fat soluble vitamins A,D,E,K

these 4 fat solubles are regarded as lipds.

10. vitamin B12 ,folate/folicacid ,and vit B6   is deficency to cause Anemia.

this deficeny cause megaloblastic Anemia.

in this Anemia bone marrow produces red blood cells are large and abnormal.

7. the visual pigment of rhodopsin is made up of opsin and retinal       .

rhodopsin is a light sensitive receptor protein involved in visual phototransduction.

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