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NATALIA SIVACKOVA Ribosomes and Transfer RNA. All tRNA Molecules Have… Sections that become double stranded by base pairing A triplet of bases called.

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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:

1 NATALIA SIVACKOVA Ribosomes and Transfer RNA

2 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

3 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

4 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

5 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

6 Peptide Bonds Ribosomes are the site for polypeptide synthesis = linking amino acids together by a condensation reaction

7 Vocabulary tRNA activating enzyme Free ribosomes Bound ribosomes REFERENCES: Study Guide pg. 63 HL book pg.

8 Bibliography hap05/Chapter05.html hap05/Chapter05.html s/ribosomes.html s/ribosomes.html olec.htm olec.htm


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