NEET2026BiologyChapterActual
Match List I with List II: List I List II A Backbone of DNA I Connects a nitrogenous base to pentose sugar B N-glycosidic linkage II Connects complementary nitrogenous bases C Phosphodiester linkage III Formed by sugar and phosphates D Hydrogen bonds IV Connects two adjacent nucleotides Choose the correct answer from the options given below:
Options
- AA-III, B-IV, C-I, D-II
- BA-III, B-I, C-IV, D-II
- CA-IV, B-I, C-III, D-II
- DA-III, B-II, C-IV, D-I
Correct answer
B. A-III, B-I, C-IV, D-II
Step-by-step solution
The backbone of a polynucleotide chain (DNA) is formed by sugar and phosphates. Thus, A matches III. A nitrogenous base is linked to the pentose sugar through an N-glycosidic linkage to form a nucleoside. Thus, B matches I. Two nucleotides are linked through a 3'-5' phosphodiester linkage to form a dinucleotide. Thus, C matches IV. The two strands of the DNA double helix are held together by hydrogen bonds between complementary nitrogenous bases (Adenine pairs with Thymine via two hydrogen bonds, and Guanine pairs