When the cell is not dividing chromatin exists as a

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Unformatted text preview: omatin exists as a mass of very long, thin fibers that are not visible with a light microscope. G1 of Interphase Cell grows to almost double Enzymes and organelles double in number Restriction point Must be passed in order to divide G0 state if not dividing S phase DNA is an organic molecule with nucleotides as building blocks A double-stranded, helical nucleic acid molecule capable of replicating and determining the inherited structure of a cell's proteins. To count the number of chromosomes, count the number of centromeres During DNA replication, special enzymes move up along the DNA ladder, unzipping the molecule as it moves along. New nucleotides move in to each side of the unzipped ladder. Which nucleotide is added depends on the base present. Two identical molecules of DNA are left behind. Each contains one side of the original DNA and one side made of "new" nucleotides. Semi-conservative replication n = # of chromosome sets Human Somatic cells have 2 sets of chromosomes, so they are 2n (diploid) Somatic- Any cell in a multicellular organism except a sperm or egg cell. Gametes, are cells with only 1 set of chr...
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