153A_Exam1_S10_answers

153A_Exam1_S10_answers - Chemistry and Biochemistry 153A...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Chemistry and Biochemistry 153A, Spring 2010 Exam 1 Answers 1. (2) True 2. (2) True or False (because of ambiguity in the question) 3. (3) b, c 4. a. (3) C 1 , C 2 , O 1 , N 2 , C 3 , C 6 b. (2) C 2 , N 2 , C 3 , C 7 c. (2) N 1 , C 1 , C 2 , N 2 5. a. (2) 2 n stereoisomers for n chiral centers: 2 2 = 4 aldoses and 2 1 = 2 ketoses; 6 total b. (1) 3 c. (4) 6. (4) Both anomeric carbons (of glucose and fructose) are involved in the glycosidic linkage of sucrose. This leaves no free anomeric carbons available to form glycosidic bonds between sucrose units. 7. (3) a, d 8. (4) a. pH < 2 b. none c. none d. none e. 2 < pH < 8.5 f. 8.5 < pH < 9.5 g. pH > 9.5 h. none 9. (2) a 10. (6) a. E, b. C, c. F 11. (5) The hydrophobic effect drives protein folding, pushing together a protein’s hydrophobic sidechains to free up ordered water. The hydrophobic portions of amphipathic compounds can interact with the protein’s hydrophobic sidechains and shield them from water. They allow water entropy to increase without the protein needing to fold. 12.
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 08/26/2011 for the course CHEM 153A taught by Professor Staff during the Spring '05 term at UCLA.

Ask a homework question - tutors are online