Which of the following statements about translation is false?
a. a special trna that does not have an attached amino acid binds to stop codons to terminate translation.
b. the first three bases at the 5' end of an mrna are the aug at which translation begins.
c. the codon for methionine appears only at the beginning of the mrna for a protein, not in the middle or in the end.
d. ribosomes move along an mrna in the 3' to 5' direction.
e. all of the above are false.

e. All of the above are False.

Explanation:

A tRNA is a transfer RNA that carries amino acid from the cell pool to the mRNA-ribosome complex. The anticodon sequence of tRNA is complementary to the mRNA codons and bind to the respective amino acids. None of the tRNA has anticodon for stop codons and therefore, as soon as the ribosome reaches stop codon, protein translation terminates.

AUG is the initiation codon for protein synthesis and codes for methionine when present at a site other than the start site. The initiation codon is often preceded by an untranslated sequence, also called leader sequence. The ribosome moves along the mRNA in 5' to 3' direction in a GTP dependent manner to facilitate elongation of the polypeptide chain.

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