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4804102262
30.11.2021 •
Biology
Which of the following refers to the just-noticeable difference between two stimuli?.
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Ответ:
The method of identifying the correct codon for transcription is by means of the control STOP codons, which are those that face point mutations of the second, third or first position (the third position is the most imperceptible and usually goes unnoticed) they generate a STOP or stop of the process, causing a premature termination of the translation which causes an incomplete protein to be translated and, in most cases, not functional ... There are also start codons that are those that are in charge of start said process.
The start codon is not only a signal to start the translation, but it is translated effectively, so that, at least before their proteolytic processing, all eukaryotic proteins have a methionine at their amino terminus, which is the amino acid corresponding to the codon according to the genetic code. In prokaryotes, said methionine is modified as N-formylmethionine. This does not mean that all the components of the proteome possess said methionine at its end, since it is common for it to be enzymatically cleaved
Explanation:
Although AUG is the most widely used start codon in eukaryotes, there are other codons that are also valid as the start of translation. Such exceptions are much more common in prokaryotes, where GUG and UUG can be used as alternative translation start codons. For example, Escherichia coli, a bacterium in the Enterobacteriaceae family, uses ATG (AUG in RNA) in 83% of cases, GTG in 14% (GUG in the transcript) and TTG in 3% (UUG in RNA) and still someone else.