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Doss [256]
3 years ago
7

The observations of Hooke and van Leeuwenhoek documenting the existence of microscopic cells formed the basis of what important

theory?A. the cell theory stating that all living things are composed of cellsB. the theory of spontaneous generation, which held that life forms could arise spontaneouslyC. the theory of chemotherapy, or use of antimicrobials to destroy pathogenic organismsD. the germ theory of disease and causative agents
Biology
1 answer:
PIT_PIT [208]3 years ago
4 0

A. the cell theory stating that all living things are composed of cells.

Hope this helps!

-Payshence

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What technique did Hershey and Chase use in their experiment that led to the conclusion that DNA, not protein, was the genetic m
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Answer:

They used radioactive labeling techniques to build two different types of phage.

Explanation:

In 1952, a set of experiments were carried out by American biochemists Alfred D. Hershey (1908-1997) and Martha Chase. They prepared two separate virus samples, one contained DNA labeled with a radioactive isotope and the other contained protein labeled with a different radioactive isotope. They grew the two types of viruses separately, infected bacteria with the two sets of phages and analyzed the bacteria for radioactivity. From the results obtained, Hershey and Chase concluded that the viral genetic material was DNA and not protein, reinforcing the observations previously made by Avery.

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3 years ago
The benefit of measuring the initial rate of a reaction, V0, is that early in the course of the reaction, A) Km is the substrate
aleksandr82 [10.1K]

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Rate of product formation is linear and [S] has not been lowered significantly.

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The rate of enzyme-catalyzed reactions is affected by several factors, the contraction of substrates [S] is one of them. The substrate concentration keeps on changing as the reaction proceeds. This is why the reaction rate is measured at the initial stages of reactions when the substrate concentration [S] is much greater than the concentration of the enzyme. It is called the initial rate or initial velocity.

Under the conditions of higher substrate concentration and relatively much lower enzyme concentrations, only a few molecules of substrates are being converted into product. At a relatively higher substrate concentration, the rate of product formation increases linearly.

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The option C.
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