Question

Choose the correct answers from the alternatives given :
In a DNA molecule

• A. bases are hydrogen-bonded to one another
• B. sugars are covalently bonded to the phosphates
• C. bases are covalently bonded to the sugars
• D. all of these

Answer 1

The correct option is D all of these

A nucleic acid, like that of DNA, consists of a sugar, nitrogenous bases, and phosphate groups. The nitrogenous bases found in DNA are bonded to each other by the means of hydrogen bonds. The nitrogenous base such as Adenine bonds with thymine using double hydrogen bonds while guanine bonds with cytosine using triple hydrogen bonds. The deoxyribose sugar so found is bonded to the phosphate group by a covalent bond. The nitrogenous bases are also covalently bonded to the sugars.

So, the correct option is 'all of these'.