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प्रश्न
How is the structure of DNA organized?
उत्तर
DNA is the hereditary material, as it contains genetic information. It is a large molecule consisting of millions of nucleotides, so it is called a polynucleotide. Each nucleotide consists of three components.
(a) A sugar molecule – Deoxyribose sugar
(b) A nitrogenous base – There are two types of nitrogenous base in DNA they are
- Purines (Adenine and Guanine)
- Pyrimidines (Cytosine and Thymine)
(c) A phosphate group – The polynucleotide chains from a double helix. Nitrogenous bases in the centre are linked to sugar-phosphate units, which form the backbone of the DNA. Pairing between the nitrogenous bases is very specific and is always between purine and pyrimidine, linked by hydrogen bonds.
Adenine (A) links Thymine (T) with two hydrogen bonds [A=T]. Cytosine (C) links Guanine (G) with three hydrogen bonds (C = G). The hydrogen bonds between the nitrogenous bases make the DNA molecule stable. The nucleotides in a helix are joined together by phosphodiester bonds.
Structure of DNA
APPEARS IN
संबंधित प्रश्न
Answer the following question in your own words.
Describe the structure of the DNA molecule.
Answer the following question in your own words.
Express your opinion about the use of DNA fingerprinting.
Fill in the blanks:
There are two nucleic acids ______ and ______.
Choose the correct answer :
Adenine is a __________
What is the name given to the segments of DNA, which are responsible for the inheritance of a particular character?
Match the Column I with Column II and select the correct option.
| List-I | List-II | ||
| i. | Ribozyme | a. | Lac operon |
| ii. | Friedrich Miescher | b. | DNS as genetic material |
| iii. | Alfred Hershey and Martha Chase | c. | Catalytic RNA molecule |
| iv. | Francois-Jacob | d. | DNA is acidic substance |
Through which of the following experiments DNA was proved to be the genetic material in E. coli and bacteriophage?
Decarboxylation is not involved in:
