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Standard X
Biology
DNA
Identify the ...
Question
Identify the incorrect statement/s from the following with respect to DNA.
A
Adenine and cytosine are purines.
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B
Nitrogenous bases are joined by hydrogen bonds.
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C
DNA is made up of sugar and phosphate molecules only.
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D
Adenine always pairs with guanine.
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Solution
The correct option is
D
Adenine always pairs with guanine.
DNA is made up of a sugar-phosphate backbone and four types of nitrogenous bases - adenine, thymine, guanine and cytosine.
Adenine and guanine are called purines, while cytosine and thymine are called pyrimidines.
Adenine always pairs with thymine and cytosine with guanine, via hydrogen bonding.
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