Question:

Nitrogenous bases present in DNA

Updated On: Jun 3, 2023
  • adenine, guanine, cytosine, thymine
  • adenine, guanine, cytosine, uracil
  • adenine, thymine, uracil
  • guanine, uracil
Hide Solution
collegedunia
Verified By Collegedunia

The Correct Option is A

Approach Solution - 1

In DNA, nitrogen bases are nitrogen containing organic ring compounds and are of two types; purines are two, adenine and guanine, while pyrimidines are cytosine and thymine.
Was this answer helpful?
0
0
Hide Solution
collegedunia
Verified By Collegedunia

Approach Solution -2

In the question, we are asked which of the aforementioned nucleotides is not present in DNA. Let us now look at the bases found in DNA.
DNA is a form of nucleic acid that stands for deoxyribonucleic acid. Nucleic acids are polymers of nucleotides with long chains. Phosphate groups, nitrogenous bases, and pentose sugar make up nucleotides. Thus, DNA is made up of nucleotides, and each nucleotide is made up of nitrogenous bases or nitrogen-containing nucleobases.
The four nitrogenous bases found in DNA are as follows, along with their structures:
Was this answer helpful?
0
0

Top Questions on Structure of DNA and RNA

View More Questions

Questions Asked in AFMC exam

View More Questions

Concepts Used:

Structure of DNA and RNA

DNA Structure:

Human DNA is unique and is made up of 3 billion base pairs. However, 99% of them are the same in all humans. The sequence of these bases determines what information needs to be coded that is necessary for the organism's growth and development. During the process of transcription (when DNA is replicated), a product is formed known as RNA (Ribonucleic Acid). This RNA is responsible for translating genetic information from DNA to protein followed by reading through ribosomes. 

Read More: Structure of DNA

RNA Structure:

The ribonucleic acid has all the components same to that of the DNA with only 2 main differences within it. RNA has the same nitrogen bases called the adenine, Guanine, Cytosine as that of the DNA except for the Thymine which is replaced by the uracil. Adenine and uracil are considered as the major building blocks of RNA and both of them form base-pair with the help of 2 hydrogen bonds.

RNA resembles a hairpin structure and like the nucleotides in DNA, nucleotides are formed in this ribonucleic material(RNA). Nucleosides are nothing but the phosphate groups which sometimes also helps in the production of nucleotides in the DNA.

Read More: Structure of RNA