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Slide 1

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Transcription and translation…read more

Slide 2

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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
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

Slide 4

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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
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

Slide 5

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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

Slide 6

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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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