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प्रश्न
Which of the following bases is not present in DNA?
पर्याय
Adenine
Thymine
Cytosine
Uracil
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उत्तर
Uracil
Explanation:
Uracil is rarely found in DNA, which could be an evolutionary adaptation to increase genetic stability. This is due to the fact that cytosine can deaminate spontaneously to produce uracil via hydrolytic deamination.
Chemical formula: C4H4N2O2
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संबंधित प्रश्न
Write the structure of a nucleoside
Which of the following NOT present in DNA?
(a) adenine
(b) Guanine
(c) Thymine
(d) Uracil
Write the structure of a nucleotide
What type of linkage is present in nucleic acids?
Define the following term:
Nucleotide
What are nucleic acids?
Give balanced equations for the following reactions:
Name the nitrogen base residues present in DNA
The presence or absence of hydroxyl group on which carbon atom of sugar differentiates RNA and DNA?
Which base is present in RNA, but not in DNA?
Nucleic acids are the polymers of ______.
Aldopentoses named as ribose and 2-deoxyribose are found in nucleic acids. What is their relative configuration?
Write the structures of fragments produced on complete hydrolysis of DNA. How are they linked in DNA molecule? Draw a diagram to show pairing of nucleotide bases in double helix of DNA.
Purine derivative among the following bases is ______.
Which of the following contributes to the double helical structure of DNA?
Which of the following statements is not true about RNA?
Write two differences between DNA and RNA.
Mention two important functions of nucleic acids.
Assertion (A): The backbone of DNA and RNA molecules is a chain consisting of heterocyclic base, pentose sugar and phosphate group.
Reason (R): Nucleotides and nucleosides mainly differ from each other in the presence of phosphate group.
State the functions of RNA and DNA.
