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外研2003课标版《Reading and vocabulary》优质课PPT课件下载
Fast-reading
Time
Scientist
Discovery
1866
Mendel
1953
Watson
and Crick
1973
Cohen
and Boyer
Both the parent plants had influenced the genetic make-up of the new plant.
The structure of acid DNA
A procedure to use enzymes to unzip the DNA, to cut out a sequence of genes and finally
insert them into the host cell and combine with its DNA.
Fast-reading
Read the passage again and find the paragraphs which describe:
1.When the structure of DNA was discovered
2. how to clone something
3.four possible reasons for cloning
4.the disadvantages of cloning
5.the research into DNA has helped solve crime
6.Cohen and Boyer discovered a procedure
P1