The Discovery of DNA

The (0) A that genetic information in animals and plants is carried by something (21) ___ DNA is now regarded as general knowledge. Before the 1950s, however, (22) ____ was known about DNA or how it worked. One of the greatest moments in science occurred in 1953, when Francis Crick and James Watson at Cambridge University discovered the structure of DNA. They said that DNA was (23) ____ to two spiral staircases going up and down at the same time. Scientists all over the world (24) ____ this "double helix" model immediately. The discovery was, of course, the result of years of hard work, and Crick and Watson were not the only scientists who had been (25) _____ out research in an attempt to find out what DNA looked like. Maurice Wilkins and Rosalind Franklin at King's College, London had also been working on the problem. They used X-ray analysis of DNA, (26) ____Crick and Watson preferred to build models. One day, without (27) ____ a word to her, Wilkins showed Franklin's results to Watson, and 'it was those results which (28) ____him to discover the real structure of DNA. In 1962, Watson, Crick and Wilkins were (29) ____ the Nobel Prize for their work. Rosalind Franklin, who had died four years earlier was not even (30) ____ at the ceremony.

Writing

Task 1 Read the text below. Complete the story with the correct forms of the words in brackets. Write your answers on the lines. An example (0) has been done for you.

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