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DNA was first...

Question

DNA was first proven to be the transforming factor in bacterial cells by

A

Meischer

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B

Watson and Crick

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C

Griffith

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D

Avery

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Solution

The correct option is D Avery
The first convincing evidence of the role of DNA in the heredity came from the experiments of Avery, MacLeod and McCarty, who showed that the genetic characteristics in bacteria could be altered from one type to another by the treatment with purified DNA. In the studies of Streptocpccus pneumonia, they transformed mutant cells unable to cause pneumonia into the cell that could do so by treating them with pure DNA disease causing forms.
So, the correct option is 'Avery'.

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Q. The first scientist to observe live bacterial cells under microscope was _________ .

Q. Many bacteria have small circular DNA outside the genomic DNA. This extranuclear DNA

(a) Confers certain unique phenotypic characters to bacteria.
(b) Are used to monitor bacterial transformation with foreign DNA.
(c) May attach to a single mRNA and form polysome.
(d) Are also found in all eukaryotic cells.

Q. Assertion: The bacterial cells must first be made ‘competent’ to take up foreign DNA.
Reason: DNA cannot pass through cell membranes since it is a hydrophilic molecule.
Select the correct option.

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