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An individual's genetic
code is stored in his or her
DNA.…read more

Page 3

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"One gene, one
theory states that each
gene on a chromosome
codes for a single
polypeptide/protein.…read more

Page 4

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Protein synthesis begins with
DNA in the nucleus.
The DNA acts as a template for
mRNA which is made using RNA
synthetase from the template
DNA strand.
This process is called
transcription.…read more

Page 5

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DNA helicase works on the cistron
of the DNA breaking the hydrogen
bonds between the two base
strands exposing the nucleotides
in the region.…read more

Page 6

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RNA polymerase linked to the
template strand of DNA at the
start of the sequence that it
intends to copy.
The DNA is unzipped and
unwound at this point.…read more

Page 7

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RNA nucleotides align
themselves with the template
strand following the
complementary pairings:
adenine - uracil,
cytosine - guanine.…read more

Page 8

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RNA polymerase molecule
moves along the DNA adding RNA
nucleotides to the mRNA.
Following the RNA polymerase the
DNA 'zips up' and rewinds.…read more

Page 9

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The mRNA then carries the DNA
code out of the nucleus through a
nuclear pore.
Once in the cytoplasm the mRNA
attaches to a ribosome so that
can take place.…read more

Page 10

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Each ribosome is made up of two
subunits. Two tRNA molecules
which carry amino acids can be
associated with the ribosome at a
Translation begins with the the
ribosome attaching to the start
codon AUG on the mRNA.…read more


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