Answer
355.2k+ views
Hint: The experiment named the replica plating experiment was done by Esther and Joshua Lederberg to show that mutations are random and are not directed. The main hypothesis of the experiment was that the antibiotic resistant strains of bacteria which are surviving the antibiotic application, were having the resistance before itself and it is not due to the exposure.
Complete answer:
Let us know the procedure of the experiment. In this experiment, the bacteria are spread on an original plate and are allowed to produce some colonies. These colonies were stamped into a new plate containing the antibiotic streptomycin. A cloth is first placed on the original plate by which some of the bacterial colonies are stamped to it, when the same cloth is put over the other plate, the colonies get transferred. All the transferred colonies on the new plate survived even after exposure to antibiotics. So by this, scientists concluded that the colonies on new plates were already having resistance to antibiotics and they did not develop the resistance as a result of exposure to antibiotics. In this experiment, selective growth media is used which means the media contains some inhibitors that inhibit the growth of microbes and is said to be minimal media because it does not contain all the nutrients required for microbial growth. So, by this we can conclude that both minimal media and streptomycin were used.
Hence the correct answer is option A.
Note:
By this experiment, the scientists concluded that mutations are random and can occur by chance when there is any change in the environment and this is in accordance with Darwin's theory. He also proved that mutant strains were better in adapting to the environmental changes.
Complete answer:
Let us know the procedure of the experiment. In this experiment, the bacteria are spread on an original plate and are allowed to produce some colonies. These colonies were stamped into a new plate containing the antibiotic streptomycin. A cloth is first placed on the original plate by which some of the bacterial colonies are stamped to it, when the same cloth is put over the other plate, the colonies get transferred. All the transferred colonies on the new plate survived even after exposure to antibiotics. So by this, scientists concluded that the colonies on new plates were already having resistance to antibiotics and they did not develop the resistance as a result of exposure to antibiotics. In this experiment, selective growth media is used which means the media contains some inhibitors that inhibit the growth of microbes and is said to be minimal media because it does not contain all the nutrients required for microbial growth. So, by this we can conclude that both minimal media and streptomycin were used.
Hence the correct answer is option A.
Note:
By this experiment, the scientists concluded that mutations are random and can occur by chance when there is any change in the environment and this is in accordance with Darwin's theory. He also proved that mutant strains were better in adapting to the environmental changes.
Recently Updated Pages
What are the figures of speech in the poem Wind class 11 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Write down 5 differences between Ntype and Ptype s class 11 physics CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Two tankers contain 850 litres and 680 litres of petrol class 10 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
What happens when eggshell is added to nitric acid class 12 chemistry CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Why was Kamaraj called as Kingmaker class 10 social studies CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
What makes elections in India democratic class 11 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Trending doubts
What is 1 divided by 0 class 8 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Which are the Top 10 Largest Countries of the World?
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Give 10 examples for herbs , shrubs , climbers , creepers
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Differentiate between homogeneous and heterogeneous class 12 chemistry CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
The Equation xxx + 2 is Satisfied when x is Equal to Class 10 Maths
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
10 examples of evaporation in daily life with explanations
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Write a letter to the principal requesting him to grant class 10 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)