Given below is the diagrammatic representation of one of the categories of small molecular weight organic compounds in the living tissues. Identify the category shown and the one blank component $X$ in it

• A

  (a)
• B

  (b)
• C

  (c)
• Correct answer
  D

  (d)

Solution

Nucleoside is made up of ribose sugar and nitrogenous base only. Uracil forms nucleoside with only ribose sugar. So, the option with category nucleoside component uracil is correct.

Hence, the correct answer is option: 'D'.