24 Questions
Which of the following is NOT a form of vitamin A?
Cholecalciferol
What is the primary cause of Bitot's spots?
Keratinization of the conjunctiva and cornea
How does vitamin D affect calcium and phosphorus levels in the body?
Vitamin D promotes the mobilization of calcium and phosphate from the bone.
Why is vitamin D referred to as a hormone?
Vitamin D is involved in the regulation of calcium and phosphorus metabolism.
Which of the following is a toxic manifestation of excessive vitamin D intake?
Calcium deposition in the heart, arteries, and kidneys
What is the primary function of vitamin D in the body?
All of the above
Which of the following is a cause of vitamin D deficiency?
All of the above
What is the primary cause of keratomalacia?
Softening of the cornea
Which of the following statements about vitamins is true?
Vitamins cannot be synthesized in our bodies except for vitamin D and niacin.
What are provitamins?
Precursors of vitamins that are converted into vitamins inside the body.
Which of the following is an example of a vitamer?
Carotenes
What role do vitamins play as enzyme cofactors?
Help enzymes in their work as catalysts in metabolism.
How do vitamins differ from carbohydrates and lipids in terms of energy provision?
Vitamins do not contribute to energy metabolism.
What distinguishes vitamins from hormones?
Vitamins are produced within the organism.
Which characteristic describes vitamins accurately?
Essential for metabolism.
Why do vitamins not enter tissue structures?
Due to their large molecular size.
What is a distinguishing feature of the synthesis of the discussed vitamin compared to classical vitamins?
It is synthesized inside the body
What is the average half-life of the discussed vitamin?
8 hours
How does the discussed vitamin regulate its own action when not required?
It converts into an inactive metabolite
Which type of receptor does the discussed vitamin bind to before entering the nucleus to control gene regions?
Cytosolic receptor
Why does a person with chronic liver disease suffer from manifestations of vitamin D deficiency?
Impaired 25-α-hydroxylation
What are the different forms of vitamin K mentioned in the text?
(K1), (K2) and (K3)
What is the recommended daily allowance (RDA) of vitamin K according to the text?
70–140 µg
How does a deficiency of vitamin C differ from a deficiency of vitamin K according to the text?
Increased bleeding time in vitamin C deficiency
Explore the importance of vitamins as essential organic compounds required by the body for growth and health. Learn about provitamins, which are precursors converted into vitamins, and vitamers, which are different forms of a vitamin. Dive into the biochemical functions of vitamins.
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