Which base is present in RNA but not in DNA?

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).