Avery, MacLeod and McCarty observed that in the experimental tubes to which RNAse and proteinase were added, transformation could happen. This indicated that

RNA is the transforming principle

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Protein is the transforming principle

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Neither RNA nor protein could be the transforming principle

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None of the above

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Solution

The correct option is C Neither RNA nor protein could be the transforming principle
Among the three sets of experimental tubes that Avery, MacLeod and McCarty used, those to which RNAse and proteinase were added, still retained the ability to transform R strain to live S strain. It was only in the tubes to which DNAse was added, that transformation could not happen. According to the statement in this question, it is obvious that neither RNA nor protein could be the transforming principle.

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Similar questions

Q. Avery, MacLeod and McCarty observed that in the experimental tubes to which RNAse and proteinase were added, the transformation could happen. This indicated that:

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

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

Q. Match the discoveries given under column I with the respective scientists given under column II.

\begin{matrix} Column I & Column II 1) Discovery of the transforming principle & A) Avery, Macleod, McCarty 2) Biochemical characterisation of & B) Hershey and Chase the transforming principle 3) Transduction experiment & C) Griffith \end{matrix}

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

$\begin{matrix} C o l u m n - 1 & C o l u m n - i i p . W a t s o n a n d C r i c k & i . C o n f i r m e d t h a t D N A i s t h e t r a n s f o r m i n g p r i n c i p l e q . A v e r y, M a c L e o d a n d M c C a r t y & i i . D N A d o u b l e h e l i c a l m o d e l r . H e r s h e y a n d C h a s e & i i i . F i r s t i d e n t i f i e d D N A a s t h e t r a n s f o r m i n g p r i n c i p l e s . G r i f f i t h & i v . E x i s t e n c e o f a^{'} t r a n s f o r m i n g p r i n c i p l e^{'} \end{matrix}$

Q. Read the following statements and choose the appropriate option
Statement 1 - In Griffith’s experiment, when mice were injected with heat-killed R-strain and live S-strain the mice survived.
Statement 2 - In the Hershey-Chase experiment radioisotope of phosphorus -

^{32} P

was incorporated into the DNA of the viruses.
Statement 3 - In the experiment conducted by Avery, MacLeod and McCarty, they found out that in the presence of RNAse enzyme transformation of the bacteria took place.

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