BIOCHEMISTRY REVIEW. Overview of Biomolecules. Chapter 13 Protein Synthesis
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1 BIOCHEMISTRY REVIEW Overview of Biomolecules Chapter 13 Protein Synthesis
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11 Are You Getting It?? Which properties are characteristic of the normal genetic code? (multiple answers) a) A nucleotide in an mrna molecule can be part of only one codon. b) A codon can code for only one amino acid. c) Each amino acid has only one codon. d) There is one specific start codon. e) There is one specific stop codon. f) Every change in a codon produces a change in the 11 amino acid sequence of the protein.
12 Are You Getting It?? Answer Which properties are characteristic of the normal genetic code? a) A nucleotide in an mrna molecule can be part of only one codon. b) A codon can code for only one amino acid. c) Each amino acid has only one codon. d) There is one specific start codon. e) There is one specific stop codon. f) Every change in a codon produces a change in the 12 amino acid sequence of the protein.
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20 Are You Getting It?? Which properties are found in trna molecules? (multiple answers) a) They contain nucleotides. b) They are single-stranded nucleic acids. c) They have secondary and tertiary structure. d) The bases are always A, C, G, and U. e) They contain hydrogen bonds. f) They contain three specific bases that form a codon. g) They can carry an amino acid at the 3 - end. 20
21 Are You Getting It?? Answer Which properties are found in trna molecules? a) They contain nucleotides. b) They are single-stranded nucleic acids. c) They have secondary and tertiary structure. d) The bases are always A, C, G, and U. e) They contain hydrogen bonds. f) They contain three specific bases that form a codon. g) They can carry an amino acid at the 3 - end. 21
22 OVERALL REACTION amino acid + trna + ATP aminoacyl-trna + AMP + PP i 22
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30 Are You Getting It?? Which mechanisms are characteristic of aminoacyl-trna synthetases? (multiple answers) a) They form a covalent bond between an amino acid and a trna molecule. b) They break down ATP for energy. c) One enzyme can react with all twenty amino acids. d) They have two active sites to proof-read the amino acid. e) They recognize specific nucleotides in trna molecules. 30
31 Are You Getting It?? Answer Which mechanisms are characteristic of aminoacyl-trna synthetases? a) They form a covalent bond between an amino acid and a trna molecule. b) They break down ATP for energy. c) One enzyme can react with all twenty amino acids. d) They have two active sites to proof-read the amino acid. e) They recognize specific nucleotides in trna molecules. 31
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36 Are You Getting It?? Which kinds of interactions can occur between a codon and an anticodon? (multiple answers) a) They bind to each other non-covalently. b) The three base- pairs formed have equal strength. c) They bind in a antiparallel orientation. d) The first base in a codon can wobble. e) The first base in an anticodon can be a rare base. f) An anticodon can bind to only one codon. 36
37 Are You Getting It?? Answer Which kinds of interactions can occur between a codon and an anticodon? a) They bind to each other non-covalently. b) The three base- pairs formed have equal strength. c) They bind in a antiparallel orientation. d) The first base in a codon can wobble. e) The first base in an anticodon can be a rare base. f) An anticodon can bind to only one codon. 37
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43 Are You Getting It?? Which component is found in E. coli ribosomes? a) They contain two subunits of equal size. b) They contain three types of rrnas. c) They contain over 100 different proteins. d) They contain codons. e) They contain anticodons. f) They contain aminoacyl-trna synthetases. 43
44 Are You Getting It?? Answer Which component is found in E. coli ribosomes? a) They contain two subunits of equal size. b) They contain three types of rrnas. c) They contain over 100 different proteins. d) They contain codons. e) They contain anticodons. f) They contain aminoacyl-trna synthetases. 44
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46 INITIATION COMPLEX mrna 30 S subunit 50 S subunit GTP Initiation Factors First trna 46
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54 Are You Getting It?? Which events occur during the initiation of translation in E. coli? (multiple answers) a) The first codon recognized is always UAG. b) The first amino acid used is always N-formylmethionine. c) The initiation factors needed are RNA molecules. d) The first trna molecule binds to the P site. e) The 16S rrna correctly positions the mrna. f) GTP is broken down as the ribosome forms. 54
55 Are You Getting It?? Answer Which events occur during the initiation of translation in E. coli? a) The first codon recognized is always UAG. b) The first amino acid used is always N-formylmethionine. c) The initiation factors needed are RNA molecules. d) The first trna molecule binds to the P site. e) The 16S rrna correctly positions the mrna. f) GTP is broken down as the ribosome forms. 55
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65 Are You Getting It?? Which reactions occur during translation in E. coli? (multiple answers) a) EF-Tu binds to an aminoacyl-trna. b) The incoming trna binds to the A site. c) A non-covalent bond forms between two amino acids. d) The 23S rrna catalyzes movement of the mrna. e) EF- Ts causes translocation to occur. f) A protein releasing factor binds to a stop codon. 65
66 Are You Getting It?? Answer Which reactions occur during translation in E. coli? a) EF-Tu binds to an aminoacyl-trna. b) The incoming trna binds to the A site. c) A non-covalent bond forms between two amino acids. d) The 23S rrna catalyzes movement of the mrna. e) EF- Ts causes translocation to occur. f) A protein releasing factor binds to a stop codon. 66
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71 POST-TRANSLATIONAL MODIFICATIONS PROTEIN FOLDING N- and C-TERMINAL REMOVAL OF AAs MODIFICATION OF AMINO ACIDS ADDITION OF PROSTHETIC GROUPS CLEAVAGE OF POLYPEPTIDE CHAIN DISULFIDE BONDS PROTEIN TARGETING 71
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75 Are You Getting It?? Which events can occur during or after translation in E. coli? (multiple answers) a) Multiple ribosomes can bind to one mrna. b) Translation can begin only after transcription is completed. c) An mrna molecule is translated only once. d) The new protein must fold into its proper conformation. e) Amino acids in the new protein can be modified. f) Every new protein molecule binds to a prosthetic group. g) All new proteins function in the cell cytoplasm. 75
76 Are You Getting It?? Answer Which events can occur during or after translation in E. coli? a) Multiple ribosomes can bind to one mrna. b) Translation can begin only after transcription is completed. c) An mrna molecule is translated only once. d) The new protein must fold into its proper conformation. e) Amino acids in the new protein can be modified. f) Every new protein molecule binds to a prosthetic group. g) All new proteins function in the cell cytoplasm. 76
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