Answer
Gly-Gly-Gly-Gly-Gly-Gly-Gly-Gly-Gly-Gly
Work Step by Step
To get this answer, see Fig. 17.5, and note that the mRNA "GGG" means glycine or "Gly." Since there are 30 nucleotides in the mRNA, and 3 nucleotides per codon/amino acid, that makes 10 glycines in a row.