{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Fall 09 - Name CHEM 340.01 Biochemistry I Exam 1 September...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Name _______________________________________________________________________________ 1 CHEM 340.01: Biochemistry I Exam 1 September 23, 2009 Part IA and B: 1-12, 2 pts. Each; 13-17, 4 pts. Each Part II 18) (36 pts.) For Figure 1 above, write the one AND three letter abbreviations of the amino acids in the peptide. N- terminus C-terminus 1 Letter Y A Y N I N E R S 3 Letter Tyr Ala Tyr Asn Ile Asn Glu Arg Ser 19) (12 pts.) For Figure 2 , do the following: a) (5/10) M-E-R-C-Y b) (7/10) pI = 1 2 pK 1 + pK 2 ( ) Net charge a very low pH = +2 (terminal amine and arginine carry positive charges; everything else is neutral). 1 st proton to leave is terminal COOH proton (+1 net charge); next is side chain carboxylate COOH of Glu (0 net charge-this is pK 1 ); next is side chain SH of Cys (this is pK 2 ) pI = 1 2 4.25 + 8.18 ( ) = 6.22 No. Answer No. Answer 1 D 10 A 2 B 11 B 3 C 12 D 4 B 13 D 5 A 14 A 6 A 15 C 7 C 16 C 8 D 17 A 9 A
Background image of page 1

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

View Full Document Right Arrow Icon
Name _______________________________________________________________________________ 2 20) (10 pts.) HisH +     His + H + HisH + is the ionized form pK a = 6.00 pH = pK a + log His [ ] HisH + 7.4 = 6.0 + log His [ ] HisH + 1.4 = log His [ ] HisH + 10 1.4 = His [ ] HisH + 25.1 = His [ ] HisH + 25.1 HisH
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}