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Sati [7]
2 years ago
5

In the early 20th century, there was significant debate about what molecules were the hereditary material in living cells. Choos

e Frederick Griffith’s experiments with lethal S and nonlethal R strains of bacteria or Avery, McCarty, and MacLeod’s continued experiments with the bacteria and answer the following:
a. Summarize the experimental procedures and findings.
b. Explain how the experimental results supported the idea that DNA is the hereditary molecule in cells.
Biology
1 answer:
never [62]2 years ago
8 0

1. Griffith in his experiment used two related strains of bacteria (Streptococcus pneumonia), known as R and S and mice, trying to develop a vaccine against pneumonia. R strain-formed nonvirulent, rough-edged colonies  

S strain- rounded and smooth colonies, with sugar protection coat, virulent

Mice that were injected with S strain developed pneumonia and died.

But, when mice were injected with heat-killed S strain it did not cause disease in mice.

The next part of experiment is the injection of combined harmless R bacteria with harmless heat-killed S bacteria. The result was that the mouse developed pnenumonia and in blood sample from the dead mouse, living S bacteria were found.

2. From his experiment, Griffith concluded that injected together, R strain and S strain bacteria most likely “communicate”. The R-strain bacteria took "transforming principle" (we know today that this is genetic material DNA) from the heat-killed S bacteria which allowed them to "transform" into virulent bacteria.

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provide flexibility

Explanation:

According to my research on studies conducted by various medical professionals, I can say that based on the information provided within the question the role of elastic fibers is to provide flexibility. Elastic fibers contain elastin, a protein that acts like rubber and allows them to stretch and recoil like rubber bands, making them very flexible.

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6 0
2 years ago
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sveta [45]

Answer:

<u>Starch</u> is the storage form of glucose (energy) in plants and the glucose molecules are linked by alpha 1,4 glycosidic linkage.

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Explanation:

All of these sugars are polysaccaride sugars containing large number of glucose subunits.

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