CHEM 2770 Midterm: CHEM 2770 277Oct-2002 Exam
31 Jan 2019
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You must mark the answer sheet with pencil (not pen). Put your name and enter your student number on the answer sheet. Choose what you think is the best, correct answer and record your choice on the answer sheet. This exam will count for 25% of your final mark. Which of the following amino acids contains a sulfur atom: proline b) tryptophan c) methionine d) isoleucine e) tyrosine. Which of the following amino acids does not contain a nitrogen atom in its side-chain: asparagine b) alanine c) lysine d) arginine e) histidine. At ph 7, lysine, arginine and tryptophan have positively charged r-groups. At ph 7, aspartate and glutamate have negatively charged r-groups. At ph 7, threonine, serine and cysteine have polar, uncharged r-groups. A 20 ml sample of hcl solution requires 14. 4 ml of 0. 1m naoh solution for complete titration. What is the concentration of the hcl: 0. 72 m b) 0. 072 m c) 0. 0072m d) 0. 036m e) 0. 36m.
