Presentation on theme: "NATALIA SIVACKOVA Ribosomes and Transfer RNA. All tRNA Molecules Have… Sections that become double stranded by base pairing A triplet of bases called."— Presentation transcript:
NATALIA SIVACKOVA Ribosomes and Transfer RNA
All tRNA Molecules Have… Sections that become double stranded by base pairing A triplet of bases called the anticodon, in a loop of seven bases Two other loops The base sequence CCA at the 3 terminal
The base sequence of tRNA molecules varies and this causes some variable features in structure: - An extra small loop is sometimes present - The base paired sections are sometimes helical Gives tRNA distinctive 3-D shape Distinctive chemical properties Allows the correct amino acid to be attached by tRNA activating enzyme tRNA Activating Enzymes
tRNA 20 different tRNA activating enzymes tRNA activating enzyme recognizes tRNA molecules by shape and chemical properties ATP is needed for attachment of amino acids
Structure and Function of Ribosomes Protein and rRNA both for part of the structure of ribosomes 2 subunits: one large, one small 3 binding sites for tRNA on the surface of the ribosome 2 tRNA molecules can bind at the same time to the ribosome There is a binding site for mRNA on the surface of the ribosome
Peptide Bonds Ribosomes are the site for polypeptide synthesis = linking amino acids together by a condensation reaction
Vocabulary tRNA activating enzyme Free ribosomes Bound ribosomes REFERENCES: Study Guide pg. 63 HL book pg.