Fig 3 1 the dna double helix is wound around a core

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Unformatted text preview: protein) is called chromatin. Fig. 3-1 The DNA double helix is wound around a core of histone proteins to form a nucleosome, and then “packaged” further in chromatin by further winding and condensation, as shown on the right. Condensation is maximal during mitosis, when chromatin exists as a set of “chromosomes.” Each nucleosome consists of a This referred to as NUCLEOSOME. (BEADS ON A STRING) DNA double helix wraps 2.5 times around a core of 8 histone proteins. coils further in 30 nm diameter DNA loosely held in place on histone core by Histone H1 -- holds DNA in place. Histone H1 is OUTER histone holding in place!!! from here, not really sure how it happens REVIEW CHROMATIN IN BOOK!!! Fig. 3-8 Euchromatin: the LOOSEST type of chromatin that exists in nucleus!!! -"Eu" = true. Contains the DNA which is actively being transcribed. Fig. 3-9 Specific components of nucleus can be seen by TEM Nucleolus very basophilic bc of proteins, DNA, and rRNA being made in there E=Euchromatin H=Heterochromatin N=Nucleolus Euchromatin more LIGHTLY stained. Heterochromatin is MORE DENSE and thus stains darker E Heterochromatin scattered among euchromatin, particularly along the periphery IN NUCLEUS OF ACTIVE CELL, THERE'S A LARGE SPLOTCH OF DENSE STAINING THAT LOO...
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