Indian Forest Service (Mains), Chemistry optional · 2023 · Paper II
Q5(h). Complementary DNA base pairs
Question
Draw complementary DNA base pairs and show their bonding interactions.
Answer in brief
Adenine pairs with thymine through two hydrogen bonds; guanine pairs with cytosine through three.
Part of VKC Basic
Read the key points and the full model answer with VKC Basic
VKC Basic (₹999 for 6 months) opens every solved answer, the notes, the handbook and the daily answer archive. Every Mains test series includes it.
The full model answer
As written for the answer booklet: the diagram carries the working, the lines stay short. Read here only; it is not offered as a download.
The handwritten model answer pages open with the VKC plan.
CoversWatson–Crick base pairingDNA hydrogen bondsadenine–thymineguanine–cytosinecomplementary base pairs
All parts of Question 5
- 5(a) Substituent effects on anionic propagation5 marks
- 5(b) Osmium dihydroxylation of an allylic alcohol5 marks
- 5(c) Photocyclization of isomesityl oxide5 marks
- 5(d) Woodward–Fieser calculation and a name error5 marks
- 5(e) Distinguishing ortho and para xylene5 marks
- 5(f) Chemical and magnetic equivalence in styrene5 marks
- 5(g) Parent ion from a metastable peak5 marks
- 5(h) Complementary DNA base pairs5 marks