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33 Cards in this Set
- Front
- Back
Evolution is ongoing and is constrained by its past |
TRUE |
|
the most abundant chemical element in the human body dry weight is hydrogen |
FALSE |
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The 23.1 ms equals 2.31 x 10 ^ 13 fs |
TRUE |
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in the following reaction 4NH3( g)-> 2N2 (g) + 6 H2(g) the entropy |
Increases |
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Which of the following are a pair of acid and conjugate base |
HA and A- |
|
what form of this amino acid cannot exist in any pH |
E |
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what is the identity of the following organic functional group |
A) Ester |
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which molecular structure below is the predominant form of aspartic acid at pH 1 |
C) |
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Entropy is a measure of... |
D) the disorder of a system |
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what is the H+ concentration of .1 M HAc (PK = 4.7) if the pH is adjusted to 4 |
B) 1e-4 |
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what is the pk of the weak acid HA if the solution containing 0.2 M HA and 0.1 M A- exhibits a pH of 6.5 |
A) 6.8 |
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The length of the alpha helix of 20 amino acid residue is... |
A) 30 A |
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which residues in the seven residue- repeat ABCDEFG of the alpha keratin helical wheel provide a hydrophobic interaction to associate two coiled coils? |
B) a,d |
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The GFP structure is shown below. The major motif in this protein is... |
B sheets |
|
|
A) aef |
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The misfolding of amyloid beta protein leads to |
C) Alzheimers disease |
|
|
Pig |
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Spontaneous oxidation of the heme-bound Fe (II) to Fe(III) is prevented in hemoglobin by: |
C) The surrounding protein structure in each subunit |
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For beta sheets the terms parallel and antiparallel refer to |
A) the direction of the associated peptide strands |
|
|
B) [100-S-S-80] [100-S-S-70] |
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Which of the following shows resonance structures |
|
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Protein x has an absorption extinction coefficient of 0.8 mL/mg*cm at 280nm. What is the absorbance of a solution with 2.0 mg/mL of this protein (the pathlength is still 1 cm)? |
A) 1.6 |
|
What is the fractional saturation of myoglobin (YO2) at an oxygen partial pressure of 45 torr? |
E) 0.94 |
|
An enzyme cannot make a reaction thermodynamically favorable |
A) TRUE |
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Phase 2 clinical trails are focused on evaluating the safety of new drug candidates |
B) False |
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The reaction coordinate graph shown below, which locations are intermediate states |
C) none of the above |
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In the presence of a competitive inhibitor at [I]=3mM, the apparent Km is three times the Km for the uninhibited reaction. What is KI? |
C) 1.5 mM |
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The role of water in the lysozyme active site is to: |
B) Regenerate the active form of the catalytic residues at the active site |
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A 1st order rxn has t1/2 of 20min. What is the rxn rate constant k? |
C) 0.035 min^-1 |
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In a serine protease enzyme, the catalytic triad drawing in the order of the "proton shuttle network" is: |
B) Ser- His-Asp |
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For the elementary reaction A+B->P, the correct rate equation and reaction order are |
D) v=kAB, it is a second order reaction |
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Which of the following types of inhibition does this figure below reflect? |
B) uncompetitive |
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Which of the following is not true about enzymes? |
Enzymes catalyze rxns in the forward direction only |