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In the experiments that led Fredrick Griffith to discover the "Transforming Principle", which of the following was the key step in illustrating that a substance within one cell could transform another cell?
A. Live strains of pathogenic and non-pathogenic bacteria were independently injected into mice.
B. Heat killed and fragmented pathogenic bacteria cells were injected into mice.
C. Heat killed and fragmented pathogenic bacteria cells were mixed with living non-pathogenic bacterial cells and then injected into mice.
D. Live strains of pathogenic and non-pathogenic bacteria were varied together and injected into mice.
What is meant by the law of use and disuse and by the law of the transmission of acquired characteristics? According to the law of use and disuse the characteristics of a body
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What are the major gas exchange organs of the plants? How is the procedure accomplished? In covering of the leaves and of the primary structure of the stem gas exchange is made
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