BIOL 1201 Lecture Notes - Lecture 14: Start Codon, Redundant Code, Transfer Rna

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beigeelk160

11 Nov 2016

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Occurs in the cytoplasm at a ribosome mrna to polypeptide. Genetic code: mrna nucleotides: nucleotide per 1 amino acid. Degenerate or redundant code: multiple triplets that code for 1 amino acid. Met --> aug is a start codon (both met and start) Uga, uaa, uag: stop codons rrna and trna involved in this process rrna: as part of the ribosome (site of protein synthesis) trna: anti-codon and an amino acid. 5" end of mrna binds to the small ribosomal subunit and the first codon (aug) (always the first codon) pairs with a trna with the anticodon to aug this trna carries the amino acid methionine. The large subunit now binds to form a functional ribosome (p site) Small subunit binds to 5" end of rna. Moves to start codon (aug) trna binds and then large subunit chain elongation: the ribosome can bind 2 trnas (each with 1 amino acid). One in the p (peptidyl) site and the other in the.

Related Questions

Put the following list of events in the correct order following the steps required for eukaryotic gene expression: i. The ribosome shifts by one codon ii. A methionine-charged tRNA binds to the first AUG codon from the 5â end of the mRNA iii. An amino acid charged tRNA with the correct matching anticodon binds to the A-site iv. The amino acid from the tRNA in the P-site binds to the amino acid of the tRNA in the A-site v. The large ribosomal subunit binds vi. The small ribosomal subunit binds to a recognition sequence on the mRNA

violetbeetle442

Gene expression is a multi-step process. Place these events in the correct order.

Question 13 options:

charged tRNA molecules read the next codon, entering the A site of the ribosome.

Translocation of the mRNA to the cytoplasm.

Recruitment of RNA polymerase.

tRNA(Met) binds to the start codon AUG in the P site of the ribosome.

Assembly of small and large ribosome subunits on the mRNA.

Processing of the primary RNA molecule.

Release factors recognize the stop codon, signaling the release of the protein, mRNA and ribosome subunits.

Synthesis of primary RNA molecule, a direct copy of the DNA template.

Recognition of the mRNA by the small ribosome subunit .

Peptidyl transferase, transfers the amino acid of the incoming tRNA to the growing peptide chain.

Binding of transcription factors to the promoter.

blacklion206

Facts about ribosomes

Indicate whether each of the following statements aboutribosomes is true or false.

1. Ribosomes are composed of tRNA and protein. TrueFalse
2. During translation in eukaryotes, some ribosomes remain free inthe cytoplasm while others attach to protein channels embedded inthe RER. TrueFalse
3. During initiation of translation, the small ribosomal subunitjoins to the mRNA and initiator rRNA, followed by the largeribosomal subunit. TrueFalse
4. When a ribosome first assembles on the mRNA, the initiator tRNAoccupies the A site while the P and E sites are empty.TrueFalse
5. During translation, a charged tRNA first binds to the ribosomeif its anticodon matches the codon in the E site. TrueFalse
6. A peptide bond forms between the amino acid attached to a tRNAin the A site and the growing polypeptide attached to a tRNA in theP site. TrueFalse
7. Uncharged tRNA molecules in the E site are ejected from theribosome. TrueFalse
8. No more than 2 tRNA molecules are bound to a ribosome at anygiven time. TrueFalse
9. During translocation of the ribosome, tRNA molecules move fromthe P site, to the A site, to the E site, and are then ejected fromthe ribosome. TrueFalse
10. During translation, an amino acid attached to a tRNA in the Asite is transferred to a growing polypeptide attached to a tRNA inthe P site. TrueFalse

periwinklemuskrat632

BIOL 1201 Lecture Notes - Lecture 14: Start Codon, Redundant Code, Transfer Rna

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