Question

Which major concept of genetics was illustrated in the experiment by avery, MC leod and MCcarty?
A. DNA is double helix
B.DNA allows cellular transformation
C.DNA copies itself through semiconservative replication
D.Amino acid may have been the first molecule formed on earth

Answer 1

Hint: DNA is the genetic material present in the nucleus of the cell. It consists of chromosomes which have our genetic information, our characters and all information about heredity.

Complete answer:
1 : The genetic experiment done by the oswald Avery MC Leod, MC carty was illustrated by then in 1944.
2 : their experiment is also known as the transformation principle of the DNA.
3 : they performed their experiment on streptococcus pneumonia on three different strains and showed bacteria transformation not protein.
4 : they further explain the Griffith experiment on R and S strain of the bacteria.
5 : they isolate the Cell composition of a – virulent strain and treat it to break the protein chain and DNA by protease and DNAse separately after that these cell composition are mixed with the non virulent R – strain of the bacteria
6 : After that both are injected in the mice.
7 : The virulent S strain which is treated with protease developed whereas the strain which is treated with DNAase doesn't develop.
8 : This shows that the transformation process is controlled by DNA not by any protein DNA consisting of all the information of all cell functions .
9 : So from the Avery MC Leod and Mccarty experiment we know about the transforming principles of DNA.

Option B is correct.

Note:
Proteases break the protein chain and make it non functional whereas DNAse break the DNA.Ligase helps in ligation of okazaki fragments.