2002mcb200f1

2002mcb200f1 - University of Cape Town Department of...

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University of Cape Town Course Code: MCB200F Course Name: Intro to Biochemistry Paper: 1 (Practical) Date: 7 June 2002 No.of pages: 4 Marks: 117 Time: 3 Hours Venue: RW James A - p.m. ANSWER ALL THE QUESTIONS In the interest of economy please write on both sides of the exam script Please answer each section in a different answer book. Practical section each section into a separate book Section 1 Total marks 54 1. The following graph represents a titration curve for the amino acid, lysine. Answer the following questions (a – h) by choosing answers I – VII. (a) Identify all the pK a values on the lysine titration curve. (2) (b) At which points does lysine have maximum buffering capacity? (2) (c) Would lysine have a good buffering capacity at pH 7.6? (2) (d) Which point corresponds to the pI of lysine? (2) (e) At which point has the carboxyl group been completely titrated? (2) (f) At which point is lysine completely titrated (ie all protons neutralized)? (2) (g) At which point is the average net charge of lysine equal to –1? (2) (h) At which point is the average net charge of lysine equal to 0? (2) [16] 2. Carbon dioxide hydrates readily in water forming carbonic acid which dissociates to yield bicarbonate and carbonate (H 2 CO 3 , HCO 3 - , CO 3 = ) a) Calculate the relative abundance of each of the three species present in blood plasma (pH 7.4) as a percentage of the total of the three forms. (5) 1
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This note was uploaded on 01/05/2011 for the course BLY 440 taught by Professor Williams during the Fall '10 term at Alabama.

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2002mcb200f1 - University of Cape Town Department of...

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