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Question

How many different monomers are there in DNA?


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Solution

Monomers in DNA:

  1. The monomers of the DNA are called nucleotides.
  2. Nucleotides are composed of four components- a base, deoxyribose sugar, and phosphate residue.
  3. DNA is composed of four types of monomers or nucleotides-
  • Adenine: It is one of the purines bases which is made up of carbon, hydrogen, and nitrogen, arranged in two rings, one 5 membered and the other 6 membered. It pairs with thymine by a double hydrogen bond.
  • Guanine: It is the other purine base which is made up of carbon, hydrogen, nitrogen, and oxygen, arranged in two rings as adenine. It pairs with cytosine by three hydrogen bonds.
  • Thymine: It is one of the pyrimidine bases which is made up of carbon, nitrogen, oxygen, and hydrogen in a single six-membered ring.
  • Cytosine: It is also a pyrimidine base and is made up of nitrogen, oxygen, carbon, and hydrogen in a single six-membered ring.

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