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When a ribosome first attaches to an mRNA molecule, one tRNA binds to the ribosome at the start codon at the:A) A site. B) P site. C) E site.

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Lelia Lubowitz
Lelia LubowitzLv2
28 Sep 2019

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Related questions

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.

What happens when a stop codon is reached by a ribosome?

A termination tRNAter binds to the codon and the growing peptide is transferred to it. When the peptidyl-tRNAterreaches the P site, the ribosome is signaled to release the protein. The ribosome then is likely to dissociate.

A release factor binds to the codon and is used to release the growing peptide from the P site tRNA.

A termination tRNAter binds to the codon and the growing peptide is transferred to it. When the peptidyl-tRNAterreaches the P site, the ribosome dissociates. A separate peptidyl transferase then releases the protein from tRNAter.

A release factor binds to the codon and the ribosome dissociates. A separate peptidyl transferase then releases the protein from the last tRNA to which was attached.

A termination tRNAter binds to the codon and is used to release the growing peptide from the P site tRNA. The ribosome then is likely to dissociate.

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 5’ 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

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