Question

A stop codon

codes for no amino acid.
codes for the stop amino acid s-methyl-methionine AND forms a hairpin loop forcing the ribosome to fall off.
enhances the binding of the e-polymerase.
codes for the stop amino acid s-methyl-methionine.
forms a hairpin loop forcing the ribosome to fall off.

Answer 1

codes for no amino acid.

Step-by-step explanation:

A stop codon is meant for translation termination and does not specify any amino acid. There are three stop codons named UAA, UAG and UGA. These are also known as non sense codons. If any of these are encountered while translation is going on, the translation immediately stops. So if there are 100 codons including stop codon in an mRNA then only 99 amino acids will get incorporated.