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Vitamins Overview

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Questions and Answers

What are the two main groups that vitamins are classified into?

Synthetic and natural vitamins

Fat-soluble and water-soluble vitamins (correct)

Organic and inorganic vitamins

Essential and non-essential vitamins

Which of the following is NOT a characteristic of fat-soluble vitamins?

Excess can lead to hypervitaminosis

Require the presence of lipids and bile salts for absorption

Can be stored in the body

Easily excreted through urine (correct)

What is the main difference between fat-soluble and water-soluble vitamins in terms of storage and excretion?

Fat-soluble vitamins can be stored in the liver, while water-soluble vitamins have no appreciable storage (correct)

Both fat-soluble and water-soluble vitamins can be stored in the body indefinitely

Both fat-soluble and water-soluble vitamins are easily excreted from the body

Water-soluble vitamins are stored in the body, while fat-soluble vitamins are excreted

What is the term used to describe the precursor forms of vitamins that are converted to active vitamins in the body?

Provitamins Signup and view all the answers

Which of the following statements about the differences between fat-soluble and water-soluble vitamins is INCORRECT?

Water-soluble vitamins are more likely to be synthesized in the body, while fat-soluble vitamins must be obtained from the diet Signup and view all the answers

What is the main function of vitamin A in the body?

To regulate gene expression Signup and view all the answers

Which of the following is not a source of preformed vitamin A?

Carrot Signup and view all the answers

What is the main difference between retinal and retinoic acid in the vitamin A metabolism?

Retinal is involved in vision, while retinoic acid is involved in gene regulation Signup and view all the answers

Which of the following is a characteristic of fat-soluble vitamins?

Soluble in fat solvents Signup and view all the answers

What is the primary cause of color blindness related to vitamin A?

Defective apoprotein production due to faulty genes Signup and view all the answers