Answer:
Only the extracts from heat-killed cells treated with RNase are unable to transform nonvirulent bacteria into virulent bacteria.
Explanation:
The experiment by Avery, McCarty and MacLeod aimed to identify Griffith's "transforming principle," which is a principle that explains how transformation is a way of recombining, exchanging, or transferring genetic information between organisms or from one organism to another. For this, they used cell that were heat inactivated and purified the transforming principle of these cells.
The purified cells did not give positive results in the tests done by the scientists, but they presented transformants very similar to the DNA. However, Avery suspected that the result should be reinterpreted and that the molecule was not a DNA. This is because RNA degrading enzymes had no effect on the transforming principle and only RNase-treated heat-killed cell extracts are unable to transform non-virulent bacteria into virulent bacteria.
The relationship of of Gregor's family with each other are not nice, they are full of stress and pain and disdain.
<u>Explanation:</u>
The connections in the Samsa family unit are characterized by strain and disdain. Prior to his transformation, Gregor is the main working relative. Gregor's mom attempts to shield him once in a while, however she surrenders to her better half's outrage.
Gregor's change into a creepy crawly goes about as an illustration for his human life. His family treats him like a useless bug; they compel him to help them through working an extremely requesting activity as a business explorer.
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Answer: 1930s
The term stress as it relates to the human condition first emerged in scientific literature in the 1930s, but it did not enter the popular vernacular until the 1970s (Lyon, 2012).
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