Cuál de los siguientes eventos ocurre primero en la transcripción?
A. La ARN polimerasa usa la hebra de ADN como plantilla para sintetizar una hebra de ARN complementaria.
B. La hebra de ARN crece hasta que se ha transcrito un gen completo.
C. El complejo compuesto por la ARN polimerasa y las proteínas se descompone.
D. El ADN se desenrolla y se forma una secuencia específica de nucleótidos a lo largo del promotor.
E. Un complejo grande que está compuesto por la ARN polimerasa y otras proteínas se ensambla en la hebra de ADN.
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Ответ:
The process of translation or protein synthesis stops when the tRNA binds to any one of the three codons that are UGA, UAG or UAA.
These do not code for any amino acid therefore they send the signal for protein termination. The stop codon in the A site forces the peptidyl transferase to add the water molecule in the presence of release factors.
This frees the carboxyl end of the protein which holds the protein attached to the ribosome, therefore, the synthesised protein at that time is released into the cytoplasm.