Hershey and Chase Experiment

Q. The final proof for DNA as the genetic material came from the experiments of :

1. Griffith
2. Hershey and Chase
3. Avery, Mcleod and McCarty
4. Hargobind Khorana

Q.

Match the names of the scientists listed in Column-I with their respective discoveries in Column-II.

$\begin{array}{cc}Column-I& Column-II\\ p.WatsonandCrick& i.ConfirmedthatDNAisthetransformingprinciple\\ q.Avery,MacLeodandMcCarty& ii.DNAdoublehelicalmodel\\ r.HersheyandChase& iii.FirstidentifiedDNAasthetransformingprinciple\\ s.Griffith& iv.Existenceofa{}^{\prime }transformingprincipl{e}^{\prime }\end{array}$

1. p - ii, q - iii, r - i, s - iv

2. p - iii, q - i, r - iv, s - ii

3. p - ii, q - iv, r - i, s - iii

4. p - iv, q - i, r - ii, s - iii

Q.

State whether true or false:

Hershey and Chase used bacteria in their experiment to confirm that DNA is the genetic material in organisms.

1. True
2. False

Q.

Which of the following statements is true about the Hershey-Chase experiment?

1. R-strain contain phosphorus and thus can be labelled with radioacting phosphorus.

2. DNA contain sulphur and can be labelled with ${}^{35}S$

3. Most of radioactivity was found associated with cells inferted by bacteriophage having radioactive sulphur.

4. Most or radioactivity was found associated with cell infeted by bacteriophage having radioctive phosphorus.

Q.

Which of the following observations helped Hershey and Chase confirm that DNA is the genetic material?

1. R strain of pneumococcal bacteria gets transformed into S strain.

2. The sample to which DNAse was added could not transform.

3. Phage particles grown in a medium containing radioactive phosphorus could transmit radioactivity to the daughter phage particles.

4. DNA has a double helical structure.

Q.

Name two radioactive elements discovered by Madam Curie

Q.

The two radioactive elements discovered by Madam Curie were named as ______ and _____________

Q. State whether true or false:

Hershey and Chase observed after centrifugation of the radiolabelled culture media that, most of the phosphorus was found in the pellet, while sulphur was found in the supernatant.

1. True
2. False