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ch 16 (proteins (DNA replication fork (1) primase synthesises a dhort RNA…
ch 16
proteins
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DNA polyemerase proofread new DNA replacing incorrect nucleotiedes. in mismatch pairs enzymes correct errors that persist
meselson stahl experiment showed that DNA replication is semi conservative. the parental molecule unwinds and each strand then serves as a template for the synthesis of a new strand according to base pairing rules.
nucleotide excision repair is a proccess by with nucleases cut out and other enzymes replace damaged stretches of DNA
the ends of eukaryotic chromosomal DNA get shorter with each round of replication the presence of telomeres repetitive sequences at the ends of linear DNA molecules postpone the erosion of genes telomeres catalyze the lengthening of telomeres in germ cells
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chromosomes
chromosomes of most bacterial species is a cricular DNA molecule with some associated proteins making up the nucleoid the chromatin making up a eukaryotic chromosome is composed of DNA, histines and other proteins
histones bind to eachother and DNA to form nucleosomes the most basic packing of DNA.histone tails extend outward from each bead like nucleosome core.
chromosomes occupy restricted areas in the interphase nucleus. most chromatin is less compacted euchromatin but some remain highly condensed heterochromatin