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Question

Which of the following general statements about the structure of DNA is true?


A
The Hydrogen bonds connecting base pairs exist in a polar environment.
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B
Both major and minor grooves are formed between the Phosphate-sugar backbone.
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C
The same C and N atoms are present in each groove.
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D
The amount of energy required to break down the AT and GC pairs is the same.
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Solution

The correct option is A The Hydrogen bonds connecting base pairs exist in a polar environment.
  • The DNA double helical structure has two different environments. The Nitrogenous bases have an aromatic ring structure and are hydrophobic and interact with each other through base pair stacking interactions.
  •  At the same time, the back bone of DNA formed by Phosphodiester bonds is hydrophilic and interacts with water.
  •  The Nitrogenous bases of one nucleotide chain form Hydrogen bonds with the Nitrogenous bases present directly opposite them on the other chain.
  •  The Hydrogen bonds are formed in polar aqueous environment. 
  • The Adenine base pairs with Thymine with two Hydrogen bonds and Guanine base pairs with Cytosine with three Hydrogen bonds.
So, the correct answer is option A.

Biology

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