ps1 - MIT Biology Department 7.012: Introductory Biology -...

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Name __________________________ TA____________ Section ____ 7.012 F’04 Problem Set 1 September 10 th 2004 This completed problem set must be turned into the wooden box outside Problem sets will not be accepted late. Solutions will appear on the web after the due time. Question 1 A. a) Explain what an ion is. b) Explain what a van der Waals force is. c) Match the atoms and molecules listed below with the appropriate descriptive. Choose from: cation anion polar non-charged nonpolar non-charged Cl - H 2 O Na + CH 4 d) Circle the “side chain” in each of the amino acids given below . C C O O H NH 3 CH 2 CH 2 O O C - + - GLUTAMIC ACID C C O O H NH 3 CH 2 CH 2 CH 2 CH 2 NH 3 + - + LYSINE C C O O H NH 3 H - + GLYCINE C C O O H NH 3 CH 2 CH 2 O C NH 2 - + GLUTAMINE MIT Biology Department 7.012: Introductory Biology - Fall 2004 Instructors: Professor Eric Lander, Professor Robert A. Weinberg, Dr. Claudette Gardel
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2 e) Check the following terms to describe the side chains of the amino acids you circled above. Side Chain of… Charged Non Charged Polar Non Polar Hydrophobic Hydrophilic Glutamic Acid Lysine Tyrosine Asparagine Glycine Glutamine f) Explain why ethane (C 2 H 6 ) is a non-polar molecule while ethanol (C
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ps1 - MIT Biology Department 7.012: Introductory Biology -...

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