Question

What were the main criteria taken under consideration for the experiment by Hershey and Chase? a)Both DNA and protein contains sulfur and not phosphorus b)Protein contains phosphorus, DNA contains sulfur c)Both DNA and protein contains phosphorus and not sulfur d)DNA contains phosphorus, protein contains sulfur

Answer 1

Answer:

Hershey and chase concluded that DNA , not protein, was the genetic material. They dertermined that a protective protein coat was formed around the bacteriophage, but that the internal DNA is what conferred its ability to produce progeny inside a bacterium.

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Explanation:

Answer 2

Answer:

ans  :d

Explanation:

The bacteriophage attaches to the bacteria and its genetic material

then enters the bacterial cell. The bacterial cell treats the viral genetic

material as if it was its own and subsequently manufactures more virus

particles. Hershey and Chase worked to discover whether it was protein

or DNA from the viruses that entered the bacteria.

They grew some viruses on a medium that contained radioactive

phosphorus and some others on medium that contained radioactive sulfur.

Viruses grown in the presence of radioactive phosphorus contained

radioactive DNA but not radioactive protein because DNA contains

phosphorus but protein does not. Similarly, viruses grown on radioactive

sulfur contained radioactive protein but not radioactive DNA because

DNA does not contain sulfur.

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Radioactive phages were allowed to attach to E. coli bacteria. Then, as

the infection proceeded, the viral coats were removed from the bacteria by

agitating them in a blender. The virus particles were separated from the

bacteria by spinning them in a centrifuge.

Bacteria which was infected with viruses that had radioactive DNA

were radioactive, indicating that DNA was the material that passed from

the virus to the bacteria. Bacteria that were infected with viruses that had

radioactive proteins were not radioactive. This indicates that proteins did

not enter the bacteria from the viruses. DNA is therefore the genetic

material that is passed from virus to bacteria (