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The salient feature of DNA are - (i) I...

The salient feature of DNA are -
(i) It is made of two polynucleotide chain
(ii) Back bone is constituted by sugar and nitrogen base
(iii) Two chain hacve parallel polarity
(iv) Bases in two strands are paired through H-bonds
(v) The two chain are coiled in a left handed fashion

A

I, iv, v

B

I, iv

C

I, ii, v

D

I, ii, iii, iv, v

Text Solution

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The correct Answer is:
To solve the question regarding the salient features of DNA, we will analyze each statement one by one to determine its accuracy. ### Step-by-Step Solution: 1. **Statement (i): It is made of two polynucleotide chains.** - **Analysis:** This statement is correct. DNA is indeed composed of two long chains of nucleotides, which are polynucleotides, that form a double helix structure. 2. **Statement (ii): Backbone is constituted by sugar and nitrogen base.** - **Analysis:** This statement is incorrect. The backbone of DNA is made up of alternating sugar (deoxyribose) and phosphate groups, while the nitrogenous bases (adenine, thymine, cytosine, guanine) are attached to the sugars and project inward. 3. **Statement (iii): Two chains have parallel polarity.** - **Analysis:** This statement is incorrect. The two polynucleotide chains in DNA run in opposite directions, which is referred to as anti-parallel. One chain runs from the 5' to 3' direction, while the other runs from 3' to 5'. 4. **Statement (iv): Bases in two strands are paired through H-bonds.** - **Analysis:** This statement is correct. The nitrogenous bases on the two strands of DNA pair with each other (adenine with thymine, and cytosine with guanine) through hydrogen bonds. 5. **Statement (v): The two chains are coiled in a left-handed fashion.** - **Analysis:** This statement is incorrect. The two chains of DNA are coiled in a right-handed fashion, not left-handed. ### Conclusion: Based on the analysis: - **Correct Statements:** (i) and (iv) - **Incorrect Statements:** (ii), (iii), and (v) ### Final Answer: The salient features of DNA are: - (i) It is made of two polynucleotide chains. - (iv) Bases in two strands are paired through H-bonds.
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