Summary Unit 5: Mitotic Cell Cycle Notes

Topi 5 .
The Mitotic Cell
Cycle
5. 1 Chromosome Structure

Chromosomes are made
of one
very long ,
condensed DNA molecule associated with
proteins

the
proteins present
:




→ hisbones


fits
↳ and condense DNA it in nucleus
organise so




→ other
proteins are enzymes
↳ and
copy repair DMA
chromatin is a
tightly coiled combination
of DNA and proteins
↳ what chromatids and chromosomes are made of


Interphase
DNA replicates to create two identical strands
of chromatids Grill one chromosome)
joined together
by region
a called a centromere



Two chromatids that make
up
the double shutune
of a chromosome are caved sister chromatids



Each of
chromatid is made
up one
very long ,
condensed DNA molecule which ,
is made
up of a series of genes
the ends
of the chromatids are sealed with
protective structures called telomeres

, 1 Describe the structure
of a chromosome limited to
.
:
,


→ DNA
histone
→
proteins
→ sister chromatids
→ centromere

→ telomeres


chromosomes
condensed DNA molecule
are made
of
associated
one
very long ,


with
proteins

the
proteins present
.




→ hisbones

fits
↳ and condense DNA it in nucleus
organise so


→ other
proteins are enzymes
↳ and
copy repair DMA
chromatin is a
tightly coiled combination
of DNA
and
proteins
↳ what chromatids and chromosomes are
made
of
centromere is where sinner
region
a


chromatids are held
together ,
consists

of two kinetochores which are on each

chromatid .




Kinetochores hold two chromatids
together and can pull chromatids apart
centrosome
organises and distributes the spindle and is an anchor for microtubules
Microtubules




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chromatin
unnzg.sn chromatids

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