Translation

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Information about Translation
Education

Published on March 5, 2014

Author: mgettenberg

Source: slideshare.net

8.5 Translation KEY CONCEPT Translation converts an mRNA message into a polypeptide, or protein.

8.5 Translation Amino acids are coded by mRNA base sequences. • Translation converts mRNA messages into polypeptides. • A codon is a sequence of three nucleotides that codes for an amino acid. codon for methionine (Met) codon for leucine (Leu)

8.5 Translation • The genetic code matches each codon to its amino acid or function. The genetic code matches each RNA codon with its amino acid or function. – three stop codons – one start codon, codes for methionine

8.5 Translation • A change in the order in which codons are read changes the resulting protein. • Regardless of the organism, codons code for the same amino acid.

8.5 Translation Amino acids are linked to become a protein. • An anticodon is a set of three nucleotides that is complementary to an mRNA codon. • An anticodon is carried by a tRNA.

8.5 Translation • Ribosomes consist of two subunits. – The large subunit has three binding sites for tRNA. – The small subunit binds to mRNA.

8.5 Translation • For translation to begin, tRNA binds to a start codon and signals the ribosome to assemble. – A complementary tRNA molecule binds to the exposed codon, bringing its amino acid close to the first amino acid.

8.5 Translation – The ribosome helps form a polypeptide bond between the amino acids. – The ribosome pulls the mRNA strand the length of one codon.

8.5 Translation – The now empty tRNA molecule exits the ribosome. – A complementary tRNA molecule binds to the next exposed codon. – Once the stop codon is reached, the ribosome releases the protein and disassembles.

8.5 Translation – The now empty tRNA molecule exits the ribosome. – A complementary tRNA molecule binds to the next exposed codon. – Once the stop codon is reached, the ribosome releases the protein and disassembles.

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