BIO203 Midterm Past Papers

BIO203 Midterm Past Papers

BIO203 MIDTERM SOLVED PAPERS GET PDF PAPERS FILES FROM THE BELOW LINK:

Methods in Molecular Biology:

Vendrely showed that in different cells the amount of DNA for each haploid set of chromosomes is constant. 1950 E. Chargaff proved that there are numbers of adenine and thymine groups in DNA are always the same, as are the numbers of guanine and cytosine groups. 1952 A.D. Hershey and M. Chase demonstrated that only the DNA of bacteriophage T2 enters the host, the bacterium Escherichia coli, while the protein remains behind.

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BIO203 MIDTERM PAST PAPERS:

1953 J.D. Watson and F.H.C. Crick proposed a model for DNA consisting of two helically intertwined chains linked by hydrogen bonds between purines and pyrimidines. 1956 A. Gierer and G. Schramm proved that RNA is the genetic material for tobacco mosaic virus (TMV).

BIO203 MIDTERM SOLVED PAPERS:

Fraenkel-Contrat and B.Singer separated the RNA from the protein of TMV viruses, pro ced hybrid RNA viruses, and confirmed the view that RNA is the genetic material of some viruses. Mathew Meselson and Franklin W. Stahl performed the density gradient experiment (using the heavy nitrogen isotope, 15N) in bacteria to confirm Watson and Crick’s semiconservative theory of DNA replication.

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