Question

the codon uaa codes for which of these?
lysine (lys)
valine (val)
stop
tyrosine (tyr)

Explanation:

In molecular biology (a subfield of Biology), codons are sequences of three nucleotides in mRNA. UAA is one of the stop codons, which signal the termination of protein synthesis, not for an amino acid like Lysine, Valine, or Tyrosine.

Answer:

stop