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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.
why is obelia considered to of special interest in Zoology as an animal showing an intermediate grade of organisation?
Q Which are the beings that form the kingdom Animalia? What are the two big groups into which this kingdom is divided? The kingdom Animalia is the animal kingdom. usually the k
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What are the problems that vertebrates required to solve to adapt to the terrestrial environment as they came from the aquatic habitat? How evolution does solve those problems?
The cell cycle undergoes a sequence of changes which involve a period of growth replication of DNA, Followed by cell division. This sequence of changes is called cell cycle.
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X-ray Chest It is helpful in assessing heart size. One should look for presence of pericarditis, pulmonary oedema or pulmonary congestion. ECG One should look for pro
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