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What is transcription?
Transcription is the creation of a single-stranded
mRNA copy of the DNA coding strand.
It is the first stage of protein synthesis.…read more

Slide 3

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What happens during transcription?
The gene that is to be transcribed unwinds and
unzips. Hydrogen bonds between the base pairs
break.
RNA nucleotides bind to their complementary
bases with hydrogen bonds. U-A, G-C, A-T on
the template strand.
2 extra phosphoryl groups are released, which
releases energy for bonding adjacent
nucleotides.…read more

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The mRNA that is produced is complementary to
the base sequence on the original (template)
strand of DNA. It is therefore a copy of the base
sequence o the coding strand of the length of
DNA.
The mRNA then is released from the DNA,
passes out through a pore in the nuclear
envelope, and attaches itself to a ribosome.…read more

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What is translation?
The assembly of polypeptides (also known as
proteins) at ribosomes.
This is the second stage of protein synthesis.…read more

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How does it work?
Polypeptides are formed using ribosomes. A
proteins sequence is dictated by the sequence of
codons on the nucleotide bases.
A codon is a triplet of nucleotide bases.
Each codon refers to an amino acid. A chain of
amino acids makes a polypeptide.…read more

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