Exam 1 - Fall06

Exam 1 - Fall06 - BCH 3023, Fall 2006 Exam 1 BCH 3023 Fall...

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

View Full Document Right Arrow Icon
BCH 3023, Fall 2006 Exam 1 BCH 3023 NAME ____________________________ Fall Semester, 2006 Exam 1 ID ________________________________ FORM A Bubble in the Test Form Code circle on your scantron with the Form Letter shown above. Bubble in your name and student ID on the scantron. Sign the scantron using your normal signature. No electronic devices may be used during this exam. KEEP YOUR SCANTRON FACE DOWN EXCEPT WHEN RECORDING AN ANSWER. DO NOT MARK YOUR EXAM IN SUCH A WAY THAT OTHERS CAN DISCOVER YOUR ANSWER. YOU MAY OTHERWISE WRITE ANYWHERE ON YOUR EXAM FOR SCRATCH WORK. 1. A buffer is prepared by adding 0.10 mole of a monoprotic weak acid (HA) and 0.10 mole of the sodium salt of its conjugate base (A - ) to 1.0 L of water. The pH of the resulting solution is 5.0. Adding which of the following would shift the pH of this solution to 4.0? Assume ideal behavior. (log 10 x = x) a.) 0.90 mole of HA b.) 0.90 mole of A - c.) 0.90 mole of HA and 0.90 mole of A - d.) 0.90 mole of HA and 1.90 mole of A - e.) 9.0 L of water 2. In a classic protein denaturation-renaturation experiment involving ribonuclease, the function of β -mercaptoethanol (HO-CH 2 -CH 2 -SH) is to: a.) force the ribonuclease molecule to unfold, exposing the hydrophilic amino acid residues to the surrounding solvent. b.) cleave the polypeptide chain on the C-terminal side of Cys residues c.) reoxidize cross-links between MET side chains d.) reduce all –S-S- linkages to –SH + HS- e.) None of these Page 1 of 6
Background image of page 1

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

View Full DocumentRight Arrow Icon
BCH 3023, Fall 2006 Exam 1 3. The activity of a protein is close to zero at pH = 6 and below, high at pH 10 and above. The activity of this protein probably depends upon the presence of an amino acid whose R-group: a.) Has a pK R = 8 and must be protonated for activity. b.) Has a pK R = 6 and must be unprotonated for activity. c.)
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 6

Exam 1 - Fall06 - BCH 3023, Fall 2006 Exam 1 BCH 3023 Fall...

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