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Which base is present in RNA but not in DNA?

  By GK Planet Team      
Q. Which base is present in RNA but not in DNA?
  1. Uracil
  2. Guanine
  3. Thymine
  4. Cytosine
Answer: Uracil
Uracil is a base present in RNA but not in DNA.
Nucleic acids are large molecules where genetic information is stored. There are two types of nucleic acids: deoxyribonucleic acid, better known as DNA and ribonucleic acid, better known as RNA.
The nucleic acids are made of nucleotides. A nucleotide is made of a nitrogenous base, sugar with five carbon atoms and a phosphate group.

DNA is made of four types of nucleotide:
  • Adenine (A)
  • Thymine (T)
  • Cytosine (C)
  • Guanine (G)
RNA is physically different from DNA: DNA contains two intercoiled strands, but RNA only contains one single strand. RNA also contains different bases from DNA. These bases are the following:
  • (A) Adenine
  • (G) Guanine
  • (C) Cytosine
  • (U) Uracil
Uracil is a base found in RNA and not in DNA. It pairs with adenine and replaces thymine in DNA. Uracil, a pyrimidine, was originally discovered in 1900.
Thymine, or 5-methyluracil, is a pyrimidine base found in the nucleic acid DNA. Thymine is not found in RNA

A nucleotide is made up of three components: a nitrogenous base, a pentose sugar, and a phosphate group. The two main types of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA).
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