2017S_Exam 2.pdf - BCH2333C Exam#2 June 8th 2017 Student...

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BCH2333C Exam #2 June 8 th , 2017 Student name (First, Last): _______________________________ Student number: ____________________________ Instructions: Calculator permitted (Faculty approved or any other kind) Molecular model kits are permitted Cellular phones, unauthorized electronic devices or course notes (unless an open-book exam) are not allowed during this exam. Phones and devices must be turned off and put away in your bag. Do not keep them in your possession, such as in your pockets. If caught with such a device or document, the following may occur: academic fraud allegations will be filed which may result in you obtaining a 0 (zero) for the exam. By signing below, you acknowledge that you have ensured that you are complying with the above statement. Sign here:______________________________________
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BCH2333C Exam #2 June 8 th , 2017 True/False and multiple choice questions (50 points) 1. In general, proteins are most soluble in water when the pH is close to the pI True False. If false, explain why. 2. In a sterically forbidden conformation, the φ and ψ angles of the peptide backbone would orient themselves closer than their van der Waals distance. True False. If false, explain why. 3. Which amino acid does not have a primary α -group? a. Glutamine b. Arginine c. Lysine d. Proline e. Glutamate 4. The formation of a dipeptide from two amino acids involves: a. Side chain complementarity b. Loss of water c. Oxidation of the alpha carbon d. Reduction of the alpha carbon e. Base catalysis 5. The pK 1 , pK 2 , and pK R for the amino acid arginine are 1.8, 9.0, and 12.5, respectively. At pH 7.0 arginine would be charged predominately as follows: a. Carboxylate 0, amino 0, guanidine +1, net charge +1 b. Carboxylate +1, amino 0, guanidine -1, net charge 0 c. Carboxylate -1, amino +1, guanidine +1, net charge +1 d. Carboxylate +1, amino -1, guanidine -1, net charge +1 e. Carboxylate -1, amino 0, guanidine +1, net charge 0 6. Which of the following tripeptides would be expected to be the most hydrophobic? a. KYG b. KYA c. GYA d. DYA e. DYG
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BCH2333C Exam #2 June 8 th , 2017 7. Which of the following amino acids has two chiral centers? a. Ala b. Leu c. Ile d. Pro e. Asn 8. All amino acids derived form proteins have the same stereochemical conformation as: a. L-glyceraldehyde b. (R)-alanine c. D-glucose d. (S)-cysteine e. Glycine 9. In prokaryotes, the ____ factor recognizes base sequence in the _____ which facilitates RNA polymerase binding and initiates RNA synthesis.
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