Bch211 - Exam 2

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BCH211 - Exam 2
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1. 
Draw the structure of B-D-Lactose in the Hawarth projection
A.
B.
C.
D.
2.  The sign of Gibb's Free Energy is positive ("+") when energy is released
A.
B.
3.  True or false:  Enzymes, being proteins, are sensitive to temperature and will be denatured by high temperatures.
A.
B.
4.  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.
5.  Reactions requiring energy often occur with the simultaneous hydrolysis of
A.
B.
C.
D.
6.  What happens to the entropy when ATP is hydrolyzed to ADP?
A.
B.
C.
D.
7.  Which form of monosaccharides is preferred by human cells?
A.
B.
C.
D.
8.  The conditions required for maximum enzyme function are called:
A.
B.
C.
D.
9. 
The following represents the results of an experiment on a metabolic enzyme.  What is the optimum pH of this enzyme?
A.
B.
C.
D.
10. 
  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.
11.  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.
12.  Which of the following terms is a general definition of an enzyme?
A.
B.
C.
D.
13.  The structure below is shown in what anomeric form?
A.
B.
C.
D.
14.  A short description of a diastereomer would be?
A.
B.
C.
D.
15.  A Lineweaver-Burk plot is useful in the analysis of enzymatic reactions because
A.
B.
C.
D.
16. 
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.
17.  A monosaccharide used to form nucleic acids is
A.
B.
C.
D.
18. 
The structure given below has what type of glycosidic linkage?
A.
B.
C.
D.
19.  The value of Vmax changes in 
A.
B.
C.
D.
20. 
The following compounds are enantiomers of each other
A.
B.
C.
D.
21.  Structurally, glycogen is most similar to 
A.
B.
C.
D.
22.  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.
23.  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.
24. 
The following structure is shown in 
A.
B.
C.
D.
25. 
The carbohydrate below may be classified as
A.
B.
C.
D.
26.  The region of an enzyme where the substrate molecule fits is called the
A.
B.
C.
D.
27.  Sugars which contain an aldehyde group that can be oxidized are called
A.
B.
C.
D.
28.  21000 molecules were acted on by a single molecule of an enzyme in 15 minutes.  What is the turnover number?
A.
B.
C.
D.
29.  The theory that proposes a somewhat flexible enzyme conformation is the 
A.
B.
C.
D.
30.  The simplest carbohydrates are called
A.
B.
C.
D.
31.  Which of the following is correctly called a complex carbohydrate?
A.
B.
C.
D.
32.  Which of the following is a disaccharide?
A.
B.
C.
D.
33.  Which of the following is a common function of many vitamins in the body?
A.
B.
C.
D.
34. 
Which of the following terms can be used correctly to fill the blank in the following equation?  
A.
B.
C.
D.
35.  Which statement about enzymes is incorrect?
A.
B.
C.
D.
36.  True or false:  Energy is generally consumed during anabolism
A.
B.
37.  Which of the following is true of a noncompetitive inhibitor?
A.
B.
C.
D.
38.  Which of the following inhibitors binds to the enzyme at a site other than the active site?
A.
B.
C.
D.
E.
39.  The synthesis of an enzyme in response to a cellular need is called
A.
B.
C.
D.
40.  A metal ion required for enzyme activity is called
A.
B.
C.
D.
41.  Competitive inhibitors have this effect:
A.
B.
C.
D.
E.
42.  True or false:  Aspirin acts as an reversible inhibitor of the COX 2 enzyme
A.
B.
43.  Which of the following enzyme properties is explained by the lock-and-key model?
A.
B.
C.
D.
44.  In the induced-fit model of substrate binding to enzymes
A.
B.
C.
D.
45.  The cyclic form of glucose results from the formation of
A.
B.
C.
D.
46. 
A polysaccharide containing B(14) linkages is
A.
B.
C.
D.
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