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Karnataka Board PUCPUC Science 2nd PUC Class 12

Biomolecules in the Cell > Nucleic Acids

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Estimated time: 8 minutes
CISCE: Class 12

Definition: Nucleic Acids

Nucleic acids are large biological macromolecules that store and transmit genetic information in living organisms.

CISCE: Class 12

Definition: Nucleotide

A nucleotide is the basic structural unit of nucleic acids, composed of a nitrogenous base, a pentose sugar, and a phosphate group.

CISCE: Class 12

Definition: Nucleoside

A nucleoside consists of a nitrogenous base linked to a pentose sugar without a phosphate group.

CISCE: Class 12

Definition: Nitrogenous Base

A nitrogenous base is an organic molecule (purine or pyrimidine) that carries genetic information in nucleic acids.

CISCE: Class 12

Definition: DNA (Deoxyribonucleic Acid)

DNA is a double-stranded nucleic acid that stores and transmits hereditary information and can replicate itself.

CISCE: Class 12

Definition: RNA (Ribonucleic Acid)

RNA is a single-stranded nucleic acid that helps in protein synthesis and information transfer.

CBSE: Class 12
Maharashtra State Board: Class 12

Key Points: Biomolecules in the Cell > Nucleic Acids

  • Nucleic acids are biomacromolecules present in the acid-insoluble fraction and are responsible for the storage and transmission of genetic information (DNA and RNA).
  • They are polynucleotides, formed by repeated units called nucleotides.
  • Each nucleotide consists of three components: a nitrogenous base, a pentose sugar, and a phosphate group.
  • Nitrogenous bases are of two types: purines (adenine, guanine) and pyrimidines (cytosine, thymine, uracil).
  • The sugar present is either ribose (in RNA) or 2′-deoxyribose (in DNA).
  • DNA is double-stranded and contains bases A, T, G, and C, while RNA is single-stranded and contains A, U, G, and C.
  • DNA stores genetic information, while RNA plays a key role in protein synthesis and the expression of genetic information.

Video Tutorials

We have provided more than 1 series of video tutorials for some topics to help you get a better understanding of the topic.

Series 1


Series 2


Shaalaa.com | Biomolecules Plants part 21 (Nucleic Acids: DNA, RNA)

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Biomolecules Plants part 21 (Nucleic Acids: DNA, RNA) [00:14:10]
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