2 All tRNA Molecules Have… Sections that become double stranded by base pairingA triplet of bases called the anticodon, in a loop of seven basesTwo other loopsThe base sequence CCA at the 3’ terminal
3 tRNA Activating Enzymes The base sequence of tRNA molecules varies and this causes some variable features in structure:An extra small loop is sometimes presentThe base paired sections are sometimes helicalGives tRNA distinctive 3-D shapeDistinctive chemical properties Allows the correct amino acid to be attached by tRNA activating enzyme
4 tRNA 20 different tRNA activating enzymes tRNA activating enzyme recognizes tRNA molecules by shape and chemical propertiesATP is needed for attachment of amino acids
5 Structure and Function of Ribosomes Protein and rRNA both for part of the structure of ribosomes2 subunits: one large, one small3 binding sites for tRNA on the surface of the ribosome2 tRNA molecules can bind at the same time to the ribosomeThere is a binding site for mRNA on the surface of the ribosome
6 Peptide Bonds Ribosomes are the site for polypeptide synthesis = linking amino acids together by a condensation reaction
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