The ribosome workbench uses the AUG codon as a universal signal to begin translation. The AUG start codon signals the ribosome to place in the amino acid methionine because the tRNA that has methionine attached to it has the anticodon sequence UAC. Therefore the tRNA will temporarily bind to the mRNAs sequence. J
It is important to calculate the diameter of the field when first using the microscope because you can use it to determine the the approximate size of an object you are examining at the given magnification.