Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
Which one is true ? (1) A = T, G = C (2) A = G, T = C (3) C = G, T = A (4) T = U, G = AA) 1,2 and 3 are correct.
B) 1 and 2 are correct.
C) 2 and 4 are correct.
D) 1 and 3 are correct.
Correct Answer: D
Solution :
Nitrogen bases are of two types : (1) Purines base - Adenine Guanine (2) Pyrimidines - Cytosin Thymine The specific pairing between purine and pyrimidine bases proposed by Watson and Crick not only fitted very well with the radius of DNA determined from X-ray diffraction pictures but also had necessary complementary lock and key shape for efficient hydrogen bonding, which happens to be two between A and T (A = T) and three between G and C (G = C).
You need to login to perform this action.
You will be redirected in
3 sec
