Final answer:
True. Free amino acids available in the amino acid pool within cells can be taken up by muscle cells and used for protein creation.
Step-by-step explanation:
True. Free amino acids available in the amino acid pool within cells can be taken up by muscle cells and used for protein creation. Structures within cells use these amino acids when assembling proteins. However, if a particular essential amino acid is not available in sufficient quantities in the amino acid pool, protein synthesis containing that amino acid can slow down or stop.