BIOL 0280 Midterm: Exam1 2009 blank
Document Summary
Make sure that your name is on every page. This is the only way we have of matching you with your exam after grading it. Unless otherwise indicated, there is only one correct answer for each multiple-choice question. Points are indicated by the question within brackets []. There are no calculators or other electronic devices needed or allowed on this exam. Also all hats must be removed during the exam. Exams will be photocopied before being returned on thursday. Circle the correct answer: [2 points] why do amino acids, when dissolved in water, become zwitterions, [2 points] two amino acids of the standard 20 contain sulfur atoms. They are: cysteine and serine, cysteine and threonine, methionine and cysteine, methionine and serine, threonine and serine. Circle the correct answer: [4 points] draw the structure of glu-ser-tyr in the ionic form that predominates at ph 7. Draw all atoms (including hydrogens) as well as any charges necessary.
