Proteins

• What are the basic monomer units that make up proteins?

  Amino acids
• How many naturally occurring amino acids are there in proteins?


  20
• What does the presence of the same 20 amino acids in all living organisms suggest?

  It provides indirect evidence for evolution
• What is the central atom in every amino acid?

  Carbon
• What is the amino group in an amino acid?

  • --NH2
• What is the carboxyl group in an amino acid?

  • --COOH
• What type of reaction forms a dipeptide from amino acids?

  Condensation reaction
• What is produced when two amino acids combine to form a dipeptide?

  Water
• What does the R group in amino acids represent?

  A variety of different chemical groups
• What type of bond is formed between amino acids in a dipeptide?

  Peptide bond
• How can peptide bonds be broken?

  By hydrolysis reaction