What is unusual about the initiator tRNA? It carries a modified amino acid It do
ID: 177095 • Letter: W
Question
What is unusual about the initiator tRNA?
It carries a modified amino acid
It does not bind to the ribosome at the A site
It carries a modified amino acid AND it does not bind to the ribosome at the A site
Its anticodon is not complementary to the codon with which it associates
All of these are true
What stimulates the ribosome to move down one codon?
The hydrolysis of ATP
A new tRNA entering the A site
The formation of a bond between the peptide in the P site and the amino acid in the A site
A stop codon entering the A site
The release of a tRNA from the E site
If an aminoacyl-tRNA synthetase added the wrong amino acid to a tRNA, what would happen?
The ribosome would not be able to recognize the stop codon, and translation would continue to occur when it should have been terminated
The ribosome would not be able to recognize the start codon, and translation would not eb initiated.
The tRNA would associate with the wrong codon, and the wrong amino acid would be incorporate into the growing peptide.
The tRNA would carry the wrong amino acid, and it would be incorporated into the growing protein
The tRNA could not bind to the ribosome, and no amino acid would be added to the growing peptide
The segment of the DNA molecule where messenger RNA synthesis begins is called the...
promoter region.
template.
transcription terminator.
initiation site
sigma factor.
Explanation / Answer
It carries a modified amino acid Formyl methionine and it does not bind to the ribosome at the A site but instead bind to the P site.
The ribosome moves by one codon the process is called translocation, it occurs by hydrolysis of ATP, new tRNA entering the A site, formation of a bond between the peptide in the P site and the amino acid in the A site
mRNA synthesis starts at the initiation site. But the action starts by binding of RNA pol recongnised to sigma factor to the promoter
The tRNA could not bind and no amino acid would be added to the growing peptide
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