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The best A - level Biology notes (AQA) Topic 4 £5.95
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  7. Paper 1 (BIOLOGY)

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The best A - level Biology notes (AQA) Topic 4
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  • June 25, 2024
  • 8
  • 2023/2024
  • Lecture notes
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DNA
humans have
aryotic Cells
>
-
46 chromosomes


DNA is stored as chromosomes
↓


e
inear
one
Long ,
chromosomes
Molecule Of DNA
stored in
nucleus




DNA wound chromosome
a
single
around tone
(tightly coiled DNA)
proteins
(
supports Mitochondria and
and compacts
DNA Chloroplasts also have
their own DNA

(not associated with
histone proteins)
karyotic cells

↳ loose in
DNA
cytoplasm
(not in nucleus)
around
not wound




Es *
histones

·
*




>
-



supercoiled formed from
tele mutations
*




coiled chromosome


↓
circular
chromosomee ↳ means DNA can
chromosome
Sit into the cell



m
Alleles e




Non-Coding DNA
homologus pair of

most DNA doesn't code for amino acids
( chromosomes

same size and
code
some
for functional RNA
-




with same genes
(eg
. tRNA ,URNA) in same place
(fixed locus)
-

some sections are junk DNA
(introns)
-
↳onefrome from


auesome
exon
XX
untron exon
↳> removed
during dad

protein Synthesis

Heras Some


↳
DNA

non-coding repeats
same
is



repeating
sequence Produce
↓
different versions
of the same
Protein

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