ExtraCreditHomework1_KEY - Name: KEY EID: Extra Credit...

Info iconThis preview shows pages 1–4. 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 DocumentRight Arrow Icon

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

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

Unformatted text preview: Name: KEY EID: Extra Credit Homework #1 Complete questions below and hand in to a TA by the end of class, Friday, Sept. 2. 1. Draw the structures of the 20 amino acids (in their predominant form at pH 7.0, clearly showing stereochemistry). Indicate the pK a of any side chain that is ionizable. Also provide the three-letter and one-letter codes. What is a pirate’s favorite amino acid? Arginine! 2. A 1.0 L solution has a mixture of 0.05 M NaH 2 PO 4 (pK a = 6.86) and 0.10 M Na 2 HPO 4 . How much 1.0 M NaOH should be added to bring the solution to pH 7.4? pH = p K a + log([A- ]/[HA]) 7.4 = 6.86 + log([A- ]/[HA]) [A- ]/[HA] = 10 0.54 = 3.47 3.47 = (A- + x)/(HA – x) = (0.10 + x)/(0.05 – x) 0.174 – 3.47x = 0.10 + x x = 0.017 mol 0.017 mol · 1 L/mol = 0.017 L or 17 mL of 1.0 M NaOH 3. Taxol exhibits antitumor activity. Label the indicated functional groups. 1. Hydroxyl 2. Ester 3. Amide 4. Ether 5. Keto (carbonyl) 4. Draw out each of these peptides as they exist at the indicated pH (show stereocenters). 4....
View Full Document

This note was uploaded on 02/06/2012 for the course BIOCHEMIST 339K taught by Professor Keating-clay during the Spring '11 term at University of Texas.

Page1 / 5

ExtraCreditHomework1_KEY - Name: KEY EID: Extra Credit...

This preview shows document pages 1 - 4. Sign up to view the full document.

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