Vit 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.

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.

Preformed retinol is primarily found as

The recommended units of measurement for vitamin A is

• mcg RAE

• International units

• mg

• gram

Major carrier of RA

• RBP

• Albumin

• Lipoprotein

• None

CRBP, CRABP and CRALBP

• Retenoid Transport Proteins

• Serum Proteins

• Intracellular retinoid-binding proteins

• None of the choices

On average, what percent of Vit A is absorbed?

RBP without retinol is described as:

Vitamin A and its precursors (β-carotene) obtained from diet are absorbed by intestinal

epithelium cells and esterified in retinyl esters by the enzyme RE hydrolases

• True

• False