Vitamin D Regulation and Mechanism
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Questions and Answers

What is the role of retinol binding protein in the transport of retinol?

  • To facilitate the function of retinol in the liver
  • To regulate gene expression in target cells
  • To bind to retinol and transport it to extrahepatic tissues (correct)
  • To convert retinol to retinoic acid

What is the function of retinol in the retina?

  • To convert into retinal essential for vision (correct)
  • To regulate gene expression
  • To maintain fetal life in females
  • To support sperm formation

How many genes have been shown to be directly regulated by retinoic acid?

  • At least 200 genes
  • At least 50 genes
  • At least 130 genes (correct)
  • At least 100 genes

What is the role of retinol in maintenance of epithelial cells?

<p>To maintain normal differentiation of epithelial cells (D)</p> Signup and view all the answers

What is the role of retinol in reproduction?

<p>To support sperm formation in males and maintain fetal life in females (A)</p> Signup and view all the answers

What is the function of retinoic acid in cells?

<p>To bind to specific nuclear receptors (B)</p> Signup and view all the answers

What is the outcome of retinoic acid binding to specific nuclear receptors?

<p>Stimulation of gene expression (C)</p> Signup and view all the answers

What is the role of retinol in the maintenance of the cornea?

<p>To maintain the integrity of the cornea (B)</p> Signup and view all the answers

What is the mode of action of retinoic acid similar to?

<p>Hormones (D)</p> Signup and view all the answers

What is the function of retinol in growth and development?

<p>To support normal growth and development (A)</p> Signup and view all the answers

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