Question

Choose the correct answers from the alternatives given :
One species DNA differs from others in its

• A. Phosphate groups
• B. Base sequence
• C. Sugars
• D. All of these

Answer 1

The correct option is B Base sequence

Deoxyribonucleotides are the building blocks of a DNA molecule. Each nucleotide contains a deoxyribose sugar molecule, a phosphate molecule, and any one of the bases (adenine, guanine, cytosine and thymine). Since sugar and phosphate molecules are universal and the same in all organisms, the difference that occurs in DNA sequences is due to the bases present. The base sequence in one species may not be same as in other species.

So, the correct option is 'Base sequence'.