This diagram shows the process of translation. Which statement is correct? a) The mRNA code determines which tRNA molecules are used
b) The molecule of tRNA is taking away amino acids one at a time.
c) The amino acid chain is held together by mRNA
d) The molecule of tRNA bonds with mRNA before it bonds to an amino acid.

a) the mRNA code determines which tRNA molecules are used

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link:

b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.