A) Landsteiner - Blood group
B) Chargaff and Davidson - A = T, C = G
C) Watson and Crick - DNA structure
D) None of the above
Correct Answer: D
Solution :
All the combinations are correct: On the basis of presence or absence of certain antigens, ABO blood group was established by K Landsteiner in human. Rh factor was discovered by Landsteiner and Wiener in 1940. Chargaff et al; described that: (i) The base composition of DNA is different in different species. (ii) Number of purine bases is equal to number of pyrimidine bases irrespective of species. ie, A + G = T + C (iii) Ratio between the number of adenine plus thymine and guanine plus cytosine is characteristic of species and hence differ in different species A + T: G + C In 1953, James Watson and Francis Crick postulated a space-filling 3 dimensional model of DNA structure.
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