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Chapter 16 (Life's Operating Instructions (The elegant double-helical…
Chapter 16
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origins of replication
the replication of chromosomal DNA begins at particular sites called origin of replication, short stretches of DNA that have a specific sequence of nucleotide
the e.coli chromosome, like many other bacterial chromosomes, is circular and haas a single origin
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helicases
enzymes that untwist the double helix at the replication forks, separating the two parental strands and making them available as template strands
DNA, the substance of inheritance, is the most celebrated molecule of our time
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Some chemical component of the dead pathogenic cells caused this heritable change, although the identity of the substance was not known
transformation: Griffith called the phenomenon transformation, now define as a change in genotype and phenotype due to the assimilation of external DNA by a cell
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