exam2_solutions_2009

exam2_solutions_2009 - BIOL 4087 Section 3 Fall 2009 Exam 2...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
1 BIOL 4087 Section 3 Fall 2009 Exam 2 Oct 20 2009 Part 1: Multiple Choice. Pick the best answer: 5 points each 1) Which of the following amino acid side chains is most likely to be found near the outer surface of a protein in a membrane spanning region? a) Ser b) Gln c) Met d) Arg 2) You observe the following enzyme activity versus substrate concentration curve. This curve suggests that a) A non-competitive inhibitor is present b) Your enzyme is allosteric and its activity is cooperative c) Your enzyme/substrate recognition can be described accurately by the “lock and key” model d) None of the above
Background image of page 1

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

View Full DocumentRight Arrow Icon
2 3) Which of the following is NOT true of Guanyl nucleotide-binding proteins (G proteins)? a) They bind GMP in their inactivated state b) they act as intermediates in 7TM receptor-initiated signal transductions c) they have an intrinsic GTPase activity d) they can be activated in large numbers by a single activated membrane receptor 4) Phe is replaced in the polypeptide sequence nMet-Gly-Lys-Glu-Ala-Leu-Leu- Lys-Asp-Phe-Asn by amino acid X, and the total charge is increased by 1 at pH 2, but remains the same as it was for the original peptide at pH 8 and at pH 13. The new amino acid is a) Lys b) Tyr c) His d) It’s impossible to say from this information 5) Which of the following will result from adding the molecule below to a membrane bilayer made up purely of phospholipids? a) At low temperature, the membrane will be less fluid b) At high temperature, the membrane will be less fluid c) At high temperature, the membrane will be more fluid d) All of the above
Background image of page 2
3 6) The DNA segment 5’dGTTCCG3’ is transcribed to produce ___ and that product is translated to produce ___. a) 5’rGUUCCG3’ and nVal-Pro b) 5’rCAAGGC3’ and nPro-Gly c) 5’rCAAGGC3’ and nGly-Pro d) 5’rCGGAAC3’ and nArg-Asn 7) An artificial membrane bilayer is impermeable to all ions until a voltage is applied across it with NaCl on the outside. When the voltage is applied transiently, the membrane becomes permeable to Na ions but not to Cl ions. Which of the following statements is true about the resting potential at equilibrium (after the applied voltage has been released and the membrane is no longer permeable)? a)
Background image of page 3

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

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 09/13/2010 for the course BIOL 4087 taught by Professor Waldrop during the Spring '08 term at LSU.

Page1 / 13

exam2_solutions_2009 - BIOL 4087 Section 3 Fall 2009 Exam 2...

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