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?

<p>Provitamins (A)</p> Signup and view all the answers

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

<p>Water-soluble vitamins are more likely to be synthesized in the body, while fat-soluble vitamins must be obtained from the diet (A)</p> Signup and view all the answers

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

<p>To regulate gene expression (C)</p> Signup and view all the answers

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

<p>Carrot (A)</p> Signup and view all the answers

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

<p>Retinal is involved in vision, while retinoic acid is involved in gene regulation (B)</p> Signup and view all the answers

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

<p>Soluble in fat solvents (B)</p> Signup and view all the answers

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

<p>Defective apoprotein production due to faulty genes (B)</p> Signup and view all the answers

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