DNA Discovery Experiments

The final proof as DNA as genetic material came from the experiment of

• Griffith

• Hershey and chase

• Avery, Mcleod, & McCarty

• Hargovind khorana

Bacteriophages are

• Viruses

• Bacteria

• Prions

• Viroids

In Hershey Chase exp.,Protein tagging was done by-

• Radioactive Phosphorus P37

• Radioactive sulphur S 34

• radioactive sulphur 35 S

• radioactive Phosphorus 32 P

In Blender exp.,DNA tagging was done by-

• Radioactive phosphorus P 37

• Radioactive sulphur S 34

• Radioactive sulphur S 35

• Radioactive Phosphorus 32 P

Hershey-Chase exp.confirms that-

• DNA is always formed from DNA in semiconservative manner.

• Sulphur and Protein both enter in bacterial cell progeny.

• DNA is genetic material,not protein.

• Radioactive Phosphorus was only found in surrounding.

The Bacteria used for confirmation of DNA was-

• Staphylococci

• E.coli

• Salmonella typhimurium

• Clostridium tetani

Describe the process Alfred and Martha used to separate the virus particles from the bacteria.

• Heating the bacteria to high temperatures

• Using a microscope

• Spinning the infected bacteria in a blender

• Freezing the bacteria

What were the results of their experiment, and what did it indicate about the hereditary material?

• The radioactive S-35 ended up inside the bacteria, indicating proteins as the hereditary material

• Neither radioactive label ended up inside the bacteria, indicating neither DNA nor proteins as the hereditary material

• The radioactive P-32 ended up inside the bacteria, indicating DNA as the hereditary material

• Both radioactive labels ended up inside the bacteria, indicating a mix of DNA and proteins as the hereditary material

Tags

S1004637

How did the experiment by Hershey and Chase contribute to our understanding of genetics?

• It proved the existence of mitochondria

• It discovered the structure of the atom

• It provided evidence that DNA is the hereditary material

• It explained the process of photosynthesis

Who conducted an experiment using pneumocossus bacteria?

• James Watson

• Oswald Avery

• Erwin Chargaff

• Travis Scott