Unformatted text preview: protein) is called
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
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
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
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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