Q. According to Watson-Crick model, DNA exists as a …A… . The two strands of polynucleotides are …B… . The backbone is formed by the sugar …C…, …D… chain. The nitrogen bases are more or less …E… to this backbone Choose the correct options for the blanks A, B, C, D and E
A) A-chain, B-perpendicular, C-carbonate, D-base, E-parallel
B) A-helix, B-parallel, C-sugar, D-phosphate, E-perpendicular
C) A-double helix, B-antiparallel, C-phosphate, D-sugar, E-perpendicular
D) A-strand, B-parallel, C-sulphate, D-sugar, E-perpendicular
Explanation
A-double helix, B-antiparallel, C-phosphate, D-sugar, E-perpendicular. Adenine and guanine are substituted purines, while the rest (uracil, cytosine and thymine) are substituted pyrimidines
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.