of 25 > © Macmillan Learning Match each structure and description to the appropriate amino acid. لا Glycine Resources Solution Penalized Hint Submit Answ Histidine Isoleucine Answer Bank H NH₁* H-C=C C-C-COO R group partially protonated at physiological pH one chiral center smallest R group N NH H H CII H NH₁₂+ H-C-COO two chiral centers no chiral centers E CH HHH NH¸* H-C-C-C-C-COO | | HH CH, H X Attemp zoom

22-91 Which amino acid does not rotate the plane of polarized light?

For the tripeptide GlyAlaCys a. What amino acid is located at the peptides N-terminal end? b. What amino acid is located at the peptides C-terminal end? c. How many peptide bonds are present? d. How many amide linkages are present?

22-42 (a) How many atoms of the peptide bond lie in the same plane? (b) Which atoms are they?

22-65 (a) What is the difference in the quaternary structure between fetal hemoglobin and adult hemoglobin? (b) Which can carry more oxygen? (c) What would the oxygen saturation curve of fetal hemoglobin look like compared to that of myoglobin and regular adult hemoglobin?

Hemoglobin has pI=6.8. Does hemoglobin have a net negative charge or net positive charge at pH=5.3? At pH=7.3?

22-44 How can a protein act as a buffer?

22-97 Gelatin is derived from collagen by denaturation. Is a gelatin dessert likely to be a good source of dietary protein?

22-48 How many amino acid residues in the A chain of insulin are the same in insulin from humans, cattle (bovine), hogs, and sheep?

© Macmillan Learning Match each structure and description to the appropriate amino acid. Glycine Histidine NH₁₂+ NH₁₂+ H HH III H-C-C-C-C-COO- H H CH, H no chiral centers ↓ H-C-COO H one chiral center 0 Resources Solution ? Hint Sub Penalized Isoleucine H NH₁* ↓ H-C=C-C-C-COO IIII ┃┃ -z' N H NH H H smallest R group R group partially protonated at physiological pH two chiral centers Answer Bank