Proteins

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Across
  1. 3. acids – Building blocks of proteins
  2. 4. – A chain of many amino acids
  3. 5. – A protein that speeds up chemical reactions
Down
  1. 1. _ Protein that makes up hair, nails, and skin
  2. 2. Protein in red blood cells that carries oxygen (Answe)
  3. 4. bond_ The bond that links amino acids together