5. Identify L or D Isomer H H O=0 O=O C=0 HO-C-H H3N-C-H H-C-NH3 | CH2OH CH2OH CH2OH .-Amino acid -Amino acid -Glyceraldehyde 6. Define each term. a. Zwitterion b. isoelectric point 6. What is the predominant attractive force that stabilizes the formation of secondary structure in proteins? 7. Distinguish between the tertiary and quaternary levels of protein structure 8. Briefly describe four ways in which a protein could be denatured 11. Identify the structure of the following proteins as primary, secondary, Tertiary or Quaternary. LEVELS OF PROTEIN STRUCTURE HO Baru B B-Sheet o-Helo ste ****** Particle Sciences D