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

R strain of pneumococcal bacteria gets transformed into S strain.

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The sample to which DNAse was added could not transform.

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

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DNA has a double helical structure.

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Solution

The correct option is C
Phage particles grown in a medium containing radioactive phosphorus could transmit radioactivity to the daughter phage particles.

Hershey and Chase used bacteriophage in their experiment to confirm that DNA is the genetic material transmitted. While Griffith discovered the existence of a “transforming principle”, he couldn’t identify its nature. Avery and his team worked further on this, and identified that DNA is the transforming principle. It was later that Hershey and Chase went ahead to re-confirm this using bacteriophage.

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Q. Hershey and Chase experimented with radioactively labeled phosphorus and sulphur to determine that DNA and not protein is the genetic material. Which of the following was essential to this confirming experiment?

Q.
To prove that DNA is the genetic material, which radioactive isotopes were used by Hershey and Chase(1952) in their experiments?

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

$\begin{matrix} C o l u m n - I & C o l u m n - I I p . W a t s o n a n d C r i c k & i . C o n f i r m e d t h a t D N A i s t h e t r a n s f o r m i n g p r i n c i p l e q . A v e r y, M a c L e o d a n d M c C a r t y & i i . D N A d o u b l e h e l i c a l m o d e l r . H e r s h e y a n d C h a s e & i i i . F i r s t i d e n t i f i e d D N A a s t h e t r a n s f o r m i n g p r i n c i p l e s . G r i f f i t h & i v . E x i s t e n c e o f a^{'} t r a n s f o r m i n g p r i n c i p l e^{'} \end{matrix}$

State whether true or false:

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

Q. A bacterium with completely radioactive DNA was allowed to replicate in a non-radioactive medium for two generation, what % of the bacteria should contain radioactive DNA?

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