Bch211 - Exam 2

46 Questions  I  By Grj2010
BCH211 - Exam 2
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1.  21000 molecules were acted on by a single molecule of an enzyme in 15 minutes.  What is the turnover number?
A.
B.
C.
D.
2. 
If the reaction AB has G = +15 Joule/mol and the reaction BC has G = -25 Joule/mol, the overall energy change AC will be  
A.
B.
C.
D.
E.
3.  True or false:  Aspirin acts as an reversible inhibitor of the COX 2 enzyme
A.
B.
4.  Refer to Exhibit 6A.  "Hindrate" is an inhibitor of triose phosphate isomerase.  When it is added to cells at a concentration of 0.1 nM, the enzyme's Km for the substrate is unchanged, but the apparent Vmax is altered to 50nM/sec. 
A.
B.
C.
D.
5.  Which of the following is correctly called a complex carbohydrate?
A.
B.
C.
D.
6. 
The following structure is shown in 
A.
B.
C.
D.
7.  What happens to the entropy when ATP is hydrolyzed to ADP?
A.
B.
C.
D.
8.  If an inhibitor changes the slope of the Lineweaver-Burk graph, but not the x-intercept, it is this type of inhibition:
A.
B.
C.
D.
E.
9.  The theory that proposes a somewhat flexible enzyme conformation is the 
A.
B.
C.
D.
10.  Which of the following is true of a noncompetitive inhibitor?
A.
B.
C.
D.
11.  The region of an enzyme where the substrate molecule fits is called the
A.
B.
C.
D.
12.  True or false:  Enzymes, being proteins, are sensitive to temperature and will be denatured by high temperatures.
A.
B.
13.  The simplest carbohydrates are called
A.
B.
C.
D.
14. 
  1. Lineweaver Burke - If everything else has a higher slope, anything lower than it represents the activation space.  everything above it represents the inhibition space
Gibbs free energy  delta G(negative - ) = spontaneous delta G(positive +) = nonspontaneous
A.
B.
C.
D.
15.  A metal ion required for enzyme activity is called
A.
B.
C.
D.
16. 
The following represents the results of an experiment on a metabolic enzyme.  What is the optimum pH of this enzyme?
A.
B.
C.
D.
17.  The synthesis of an enzyme in response to a cellular need is called
A.
B.
C.
D.
18.  If the y-intercept of a Lineweaver-Burk plot = 1.91 (sec/millimole) and the slope = 75.3L/sec, Km equals:
A.
B.
C.
D.
E.
19.  A Lineweaver-Burk plot is useful in the analysis of enzymatic reactions because
A.
B.
C.
D.
20. 
The following compounds are enantiomers of each other
A.
B.
C.
D.
21.  Under saturation conditions, an enzyme-catalyzed reaction had a velocity V.  Which of the following would increase the rate of the reaction?
A.
B.
C.
D.
22.  The conditions required for maximum enzyme function are called:
A.
B.
C.
D.
23.  Competitive inhibitors have this effect:
A.
B.
C.
D.
E.
24.  Which of the following is a common function of many vitamins in the body?
A.
B.
C.
D.
25.  Which of the following is a disaccharide?
A.
B.
C.
D.
26.  Sugars which contain an aldehyde group that can be oxidized are called
A.
B.
C.
D.
27.  The cyclic form of glucose results from the formation of
A.
B.
C.
D.
28.  A short description of a diastereomer would be?
A.
B.
C.
D.
29. 
A polysaccharide containing B(14) linkages is
A.
B.
C.
D.
30.  The value of Vmax changes in 
A.
B.
C.
D.
31.  Which form of monosaccharides is preferred by human cells?
A.
B.
C.
D.
32.  Which of the following inhibitors binds to the enzyme at a site other than the active site?
A.
B.
C.
D.
E.
33.  The sign of Gibb's Free Energy is positive ("+") when energy is released
A.
B.
34. 
Which of the following terms can be used correctly to fill the blank in the following equation?  
A.
B.
C.
D.
35.  Which of the following enzyme properties is explained by the lock-and-key model?
A.
B.
C.
D.
36.  Structurally, glycogen is most similar to 
A.
B.
C.
D.
37.  Which statement about enzymes is incorrect?
A.
B.
C.
D.
38.  Reactions requiring energy often occur with the simultaneous hydrolysis of
A.
B.
C.
D.
39.  The structure below is shown in what anomeric form?
A.
B.
C.
D.
40. 
Draw the structure of B-D-Lactose in the Hawarth projection
A.
B.
C.
D.
41. 
The structure given below has what type of glycosidic linkage?
A.
B.
C.
D.
42.  Which of the following terms is a general definition of an enzyme?
A.
B.
C.
D.
43.  In the induced-fit model of substrate binding to enzymes
A.
B.
C.
D.
44.  A monosaccharide used to form nucleic acids is
A.
B.
C.
D.
45.  True or false:  Energy is generally consumed during anabolism
A.
B.
46. 
The carbohydrate below may be classified as
A.
B.
C.
D.
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