McqMate
| Q. |
Who among the following analysed DNA for the first time? |
| A. | Arthur Cornberg |
| B. | Hargobind Khurana |
| C. | M. W. Nirenberg |
| D. | Watson and Krick |
| Answer» D. Watson and Krick | |
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Explanation: James D Watson and Fracis Crick, the two scientists who discovered the structure of DNA in 1953. Watson and Crick took a crucial conceptual step, suggesting the molecule was made of two chains of nucleotides, each in a helix as Franklin had found, but one going up and the other going down. Crick had just learned of Chargaffs findings about base pairs in the summer of 1952. He added that to the model, so that matching base pairs interlocked in the middle of the double helix to keep the distance between the chains constant. |
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