1. Circle the letter of each sentence that is true about a light-year. a. It is a typical unit of measure for distances on Earth.
b. It is a distance of about 9.5 trillion kilometers.
c. It is the distance that light travels in a vacuum in a year.
d. It is a unit of time.

Accuracy in the translation of mrna into the sequence of amino acids in a polypeptide depends on specificity in which of the following? 1) binding of ribosomes to mrna 2) shape of the a and p sites of ribosomes 3) attachment of amino acids to trnas 4) bonding of the anticodon the codon and the attachment of amino acids to trnas