essential amino acids
primary structure
true
the elderly
true
edema
dehydration
proteins
carbon, hydrogen, and oxygen
amino acids
four
glycine
alanine
eleven
non-essential amino acids
essential amino acids
carbon skeleton
deamination
urea
animal proteins
complementary proteins
peptide bond
polypeptides
sickle-cell anemia
denaturation
secondary structure
tertiary structure
ammonia