MT1_WhiteKey

MT1_WhiteKey - Name White Key BIS102-02 Spring'08 Page 1 of...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Name White Key BIS102-02, Spring '08, Page 1 of 7 Last, First C. S. Gasser Student Authorization: I, , authorize the University to distribute publicly this graded exam ( e. g. , handed out in class, or left in a bin for me to pick up). Signature Date BioSci 102-02 Apr. 22, 2008, First Midterm Instructions: • There are seven pages in this exam including the cover sheet, please count them before you start to make sure all are present. • Write your name on each page of the exam. • Write your answers in the space provided below each question. If you need more space use the back of the page and indicate clearly that you have continued your answer on the back. Do not use additional paper. For calculation problems a clear line of calculations leading to your final answer must be shown to obtain full credit. Use the following pK a values for the exam. Amino Acid α-NH 2 α-COOH R-group log 1.0 = 0.00 Ala, Gly, Ile, Leu, Val 9.7 2.3 – log 1.5 = 0.18 Asn, Gln 9.0 2.1 – log 2.0 = 0.30 Met, Ser, Trp 9.3 2.3 – log 2.5 = 0.40 Phe 9.1 1.8 – log 3.0 = 0.48 Pro 10.6 2.0 – log 3.5 = 0.54 Thr 10.4 2.6 – log 4.0 = 0.60 Asp 9.8 2.1 3.9 log 4.5 = 0.65 Glu 9.7 2.2 4.2 log 5.0 = 0.70 His 9.2 1.8 6.0 log 5.5 = 0.74 Cys 10.8 1.8 8.3 log 6.0 = 0.78 Tyr, Lys 9.1 2.2 10.0 log 6.5 = 0.81 Arg 9.0 2.2 12.5 log 7.0 = 0.85 log 7.5 = 0.88 Question Value Score log 8.0 = 0.90 1 18 log 8.5 = 0.93 2 12 log 9.0 = 0.95 3 12 log 9.5 = 0.98 4 12 log 10.0 = 1.00 5 16 6 20 R = 8.3 X 10-3 kJ/°K•mol 7 14 25°C = 298K 8 16 9 10 10 20 Total 150 Name White Key BIS102-02, Spring '08, Page 2 of 7 Last, First C. S. Gasser 1. (18) In each blank, write the name of the strongest of the weak interactions that would be likely to occur between the side chains of the two amino acids listed next to the blank (assume an aqueous solution at pH7). Hydrophobic interaction F and W H-bond Gln and Asn Hydrophobic interaction Methionine and Leucine Salt Bridge K and D H-bond Ser and Ser H-bond D and N 2. Some biochemical applications require concentrated solutions of cesium chloride (CsCl). To make up such a solution you add 2 g of solid CsCl to 10 ml of room temperature (25°C) water and begin to mix it. As the CsCl dissolves you feel the mixture getting noticeably cold to the touch. When the CsCl is completely dissolved you measure the temperature of the solution and find it to be 4°C. a) (4) Is Δ G for the dissolution of CsCl in water at room temperature less than, greater than, or equal to zero? (circle correct answer). Why?...
View Full Document

{[ snackBarMessage ]}

Page1 / 7

MT1_WhiteKey - Name White Key BIS102-02 Spring'08 Page 1 of...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online