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Unformatted text preview: Please Write Your Name Here:__________________________________________ PLEASE READ THESE DIRECTIONS ! Bubble in the VERSION (A,B,C or D) on your Scantron. Write the Exam Number (Upper right hand corner of exam) on your Scantron. Check the last page for questions. There are 42 Questions: 40 = 100%. Choose the BEST answer for each question. Please read each question carefully and accurately. Take your time and good luck! 1. Disulfide bonds help to stabilize the Native State of proteins. An important reason for using these bonds in this role is: A) they can be broken by the reduction of cystine. B) they can be formed by reduction of cysteine. C) they can be formed by reduction of cystine. D) they can be broken by the reduction of cysteine. 2. In Figure 1, the pI of the amino acid is about pH: (This is the titration curve for an amino acid. Can you find the pI ?) A) 6 B) 12 C) 2 D) 10 3. Because amino acids contain both acidic and basic functional groups in the same molecule they are termed: A) nonessential B) amphoteric C) amphipathic D) essential 4. An example of an aromatic amino acid is: A) valine B) aspartate Biochemistry I CH1102 Exam 1 Posted to Blackboard Dr. Bert Silverman Page 1 C) phenylalanine D) lysine 5. The functionality of proteins is highly dependent on: A) their tertiary structure. B) their quaternary structure. C) their shape. D) all of the above. 6. Ishkabibble is a polymeric protein. If it is completely denatured, it will have : A) the same tertiary and quaternary structures. B) very different primary , secondary, tertiary and quaternary structures. C) very different tertiary and quaternary structures. D) a very different primary structure. 7. Which of the following is true about the properties of aqueous solutions? A) Charged molecules are generally insoluble in water. B) An increase in pH from 5 to 6 reflects a decrease in proton concentration by a factor of 100. C) They mix readily with aromatic solvents. D) Hydrogen bonds form readily in aqueous solutions. E) All of the above. 8. A non-essential amino acid: A) must come from our diet. B) is not used to make proteins C) is not used to make enzymes D) is made in our body. 9. Protein Q contains significant amounts of cystine. It is likely that Q : A) is an extracellular protein. B) C) phenylalanine D) lysine 5. The functionality of proteins is highly dependent on: A) their tertiary structure....
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