QUESTION 9: Match the statements below with the following structural features of proteins... (8 pts) Statements to match A. Formed by hydrogen bonds between parallel or antiparallel extended chains B. Regular repeating three-dimensional structures C. The bond responsible for primary structure D. Sequence of amino acids in a protein E. A plot of phi and psi angles F. Forms between two cysteine amino acids G. A rod-like structure with a tightly coiled backbone H. Angle of rotation about the bond between the N atom and the -carbon atom I. Fully extended polypeptide chain QUESTION 7: Lactic acid (pyruvate) has a pK, value of 4 . After vigourous exercise, I stabbed a needle into my leg and I determined that the concentration of the acidic form (lactic acid) was 0.4mM and the concentration of the basic form (lactate ion) was 4.0mM. Using this information. I was able to calculate the pH in my muscle What was the pH value? Show how you obtained that value. ( 5pts) Chapter 3 explored amino acids. Question 13 in that chapter investigated the ionization of functional groups in an amino acid. QUESTION 8: Lysine is shown below. I have not shown any charges or hydrogen atoms. Add hydrogens and/or charges to each image to correctly show its state of ionization at pH1,pH7 and pH14.(3pts) Page 4 of 8 Question 2 in Chapter 3 and question 4 in chapter 4 featured the single letter codes for amino acids. Answer the following question based on these two questions. QUESTION 5: Write the single-letter code for each amino acid below (10 pts) Water is discussed in chapter 2 of the textbook. Answer question 2 in that chapter, which is reproduced below... QUESTION 6: The water molecule is uncharged, yet it is able to stabilize ions in solution. Briefly explain how this is possible. Write your answer in the space below. (4 pts)