BCECE Medical BCECE Medical Solved Papers-2010

  • question_answer
    Vitamin-D is synthesised in skin by the action of sunlight on

    A)  cholesterol

    B)  7-hydroxy cholesterol

    C)  cephalin cholesterol

    D)  All of the above

    Correct Answer: B

    Solution :

    Vitamin-D is a steroid which is synthesised from cholesterol. Vitamin-\[{{D}_{2}}\] is formed from plant sterol, ergosterol which occurs in yeast and other fungi in the presence of ultraviolet light. Vitamin- \[{{D}_{3}}\]s formed from animal sterol, 7-dehydroxy cholesterol, which occurs in animal skin. Its synthesis also needs ultraviolet light.


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