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transforming principle
smooth vs rough cells |
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shows DNA not protein is genetic material using bacterial extract that had been treated w/protein digesting enzymes, but they transformed
did not transform when treated w/ DNA digesting enzymes |
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| bacteriophages- radioactively marked dna (phosphorous) and protein (sulfur) but infected only showed DNA |
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| a nucleotide is made up of.... |
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pentose five carbon sugar
nitrogen base
phosphate group |
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purines- adenine and guanine
pyrimadines- thymine, cytosine |
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| sugar base and phosphate groups formed by condensation reactions to form nucleotide, nucleotides join together to form long chains s/ phosphate sugar backbone |
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1). constant proportion of all four bases
2) constant within species but differ fron one species to anotheramount of A=T and C=G |
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| equal proportions, base pairs |
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