Match the scientist with their key finding.
| Column I | Column II |
|---|---|
| (a) Friedrich Meischer | (i) Genetic code is a triplet |
| (b) Erwin Chargaff | (ii) Identified ‘Nuclein’ in the nucleus |
| (c) George Gamow | (iii) The ratios between A and T, and G and C are constant |
| (d) F. Jacob & J. Monod | (iv) First to elucidate a transcriptionally regulated system (operon) |