Biol 55 - Vitamin A

Which statement is true about beta-carotene?

• It is absorbed up to four times more efficiently than retinol.

• It is found in fruits and vegetables.

• It is found in dairy products.

• It is found in liver.

Which of the following is NOT a function of Vitamin A?

• Vision

• Immune function

• Cell production and differentiation

• Blood clotting

Which of the following vitamins play a very key role in eyesight including night vision and color recognition?

• a. vitamin A

• b. vitamin B

• c. vitamin K

• d. all of the above

Which if the following foods are rich in Vitamin A?

• a. milk fortified with vitamin A

• b. liver

• c. orange fruits and vegetables (like cantaloupe, carrots, sweet potatoes)

• d. all of the above

Which vitamin is required for vision in dim light?

• Vitamin A

• Vitamin D

• Vitamin E

• Vitamin K

What are the health effect of vitamin A deficiency?

• hypercarotenemia

• hypertension

• xerophthalmia

• myalgia

Retinol can be found in all of the following, EXCEPT

• liver

• meat

• yellow fruit

• eggs

All of the following is true about provitamin A, EXCEPT

• Beta carotene is the most abundant provitamin A.

• Preformed vitamin A.

• Present in plant-based food.

• Example source of provitamin A is bright yellow fruits.

All of the following is true about retinol, EXCEPT

• 70-90% of preformed (retinoids) vitamin A is absorbed.

• Retinol released from food proteins combine with bile to form micelles.

• Retinol can be transferred from liver to the tissues by being bound to retinol-binding protein.

• Present in plant-based food.

Which of the following is not true about vitamin A?

• Unconverted carotenoids may function as antioxidants in the body

• Absorbed vitamin A is transported from the intestine in chylomicrons

• Active vitamin A is refers to substance that is transformed into vitamin in the body.

• The fat content of the diet and the ability to absorb fat can affect the amount of vitamin A that is absorbed