Biochemistry: The Molecular Basis of Life
6th Edition
ISBN: 9780190209896
Author: Trudy McKee, James R. McKee
Publisher: Oxford University Press
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Chapter 5, Problem 48TQ
Summary Introduction
To review:
The effect of hyperventilation on the concentration of oxyhemoglobin in the bloodstream.
Introduction:
Hyperventilation means an increase in therate of breathing. In this condition, the rate of inhalation of oxygenand exhalation of carbon dioxide are high. Hemoglobin is a protein that can bind with oxygen (O2) to form oxyhemoglobin (oxyHb) and with CO2 to form carbaminohemoglobin, depending upon their concentration.
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Examine the metabolic pathway. The enzymes that catalyze each step are identified as "e" with a numeric subscript.
e₁
e3
e4
A
B
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1°
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02
e5
e6
e7
E
F
Which enzymes catalyze irreversible reactions?
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e7
Which of the enzymes is likely to be the allosteric
enzyme that controls the synthesis of G?
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e4
es
26
5
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An allosteric enzyme that follows the concerted model has an allosteric coefficient (T/R) of 300 in the absence of substrate.
Suppose that a mutation reversed the ratio.
Select the effects this mutation will have on the relationship between the rate of the reaction (V) and substrate
concentration, [S].
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The enzyme would likely follow Michaelis-Menten kinetics.
The plot of V versus [S] would be sigmoidal.
The enzyme would mostly be in the T form.
The plot of V versus [S] would be hyperbolic.
The enzyme would be more active.
Penicillin is hydrolyzed and thereby rendered inactive by penicillinase (also
known as ẞ-lactamase), an enzyme present in some penicillin-resistant
bacteria. The mass of this enzyme in Staphylococcus aureus is 29.6 kDa.
The amount of penicillin hydrolyzed in 1 minute in a 10.0 mL. solution
containing 1.00 x 10 g of purified penicillinase was measured as a
function of the concentration of penicillin. Assume that the concentration of
penicillin does not change appreciably during the assay.
Plots of V versus [S] and 1/V versus 1/[S] for these data are shown.
Vo (* 10 M minute"¹)
7.0
6.0
5.0
4.0
3.0
20
1.0
0.0
о
10
20
30
1/Vo (* 10 M1 minute)
20
103
90
BO
70
50
[S] (* 100 M)
40
50
60
y=762x+1.46 × 10"
[Penicillin] (M)
Amount hydrolyzed (uM)
1
0.11
3
0.25
5
0.34
10
0.45
30
0.58
50
0.61
Chapter 5 Solutions
Biochemistry: The Molecular Basis of Life
Ch. 5 - Prob. 1QCh. 5 - Prob. 2QCh. 5 - Prob. 3QCh. 5 - Prob. 4QCh. 5 - Prob. 5QCh. 5 - Prob. 6QCh. 5 - Prob. 7QCh. 5 - Prob. 8QCh. 5 - Prob. 9QCh. 5 - Prob. 10Q
Ch. 5 - Prob. 11QCh. 5 - Prob. 12QCh. 5 - Prob. 1RQCh. 5 - Prob. 2RQCh. 5 - Prob. 3RQCh. 5 - Prob. 4RQCh. 5 - Prob. 5RQCh. 5 - Prob. 6RQCh. 5 - Prob. 7RQCh. 5 - Prob. 8RQCh. 5 - Prob. 9RQCh. 5 - Prob. 10RQCh. 5 - Prob. 11RQCh. 5 - Prob. 12RQCh. 5 - Prob. 13RQCh. 5 - Prob. 14RQCh. 5 - Prob. 15RQCh. 5 - Prob. 16RQCh. 5 - Prob. 17RQCh. 5 - Prob. 18RQCh. 5 - Prob. 19RQCh. 5 - Prob. 20RQCh. 5 - Prob. 21RQCh. 5 - Prob. 22RQCh. 5 - Prob. 23RQCh. 5 - Prob. 24RQCh. 5 - Prob. 25RQCh. 5 - Prob. 26RQCh. 5 - Prob. 27RQCh. 5 - Prob. 28RQCh. 5 - Prob. 29RQCh. 5 - Prob. 30RQCh. 5 - Prob. 31RQCh. 5 - Prob. 32FBCh. 5 - Prob. 33FBCh. 5 - Prob. 34FBCh. 5 - Prob. 35FBCh. 5 - Prob. 36FBCh. 5 - Prob. 37FBCh. 5 - Prob. 38FBCh. 5 - Prob. 39FBCh. 5 - Prob. 40FBCh. 5 - Prob. 41FBCh. 5 - Prob. 42SACh. 5 - Prob. 43SACh. 5 - Prob. 44SACh. 5 - Prob. 45SACh. 5 - Prob. 46SACh. 5 - Prob. 47TQCh. 5 - Prob. 48TQCh. 5 - Prob. 49TQCh. 5 - Prob. 50TQCh. 5 - Prob. 51TQCh. 5 - Prob. 52TQCh. 5 - Prob. 53TQCh. 5 - Prob. 54TQCh. 5 - Prob. 55TQCh. 5 - Prob. 56TQCh. 5 - Prob. 57TQCh. 5 - Prob. 58TQCh. 5 - Prob. 59TQCh. 5 - Prob. 60TQCh. 5 - Prob. 61TQCh. 5 - Prob. 62TQCh. 5 - Prob. 63TQCh. 5 - Prob. 64TQCh. 5 - Prob. 65TQCh. 5 - Prob. 66TQCh. 5 - Prob. 67TQCh. 5 - Prob. 68TQCh. 5 - Prob. 69TQCh. 5 - Prob. 70TQ
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