
Biochemistry: Concepts and Connections
1st Edition
ISBN: 9780321839923
Author: Dean R. Appling, Spencer J. Anthony-Cahill, Christopher K. Mathews
Publisher: PEARSON
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Chapter 22, Problem 8P
Interpretation Introduction
Interpretation:
If a
Concept Introduction:
Polymerase is the enzyme that helps in the synthesis of
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Consider the reaction.
kp
S P
kg
What effects are produced by an enzyme on the general reaction?
AG for the reaction increases.
The rate constant for the reverse reaction (kr) increases.
The reaction equilibrium is shifted toward the products.
The concentration of the reactants is increased.
The activation energy for the reaction is lowered.
The formation of the transition state is promoted.
The graph displays the activities of wild-type and several mutated forms of subtilisin on a logarithmic scale.
The mutations are identified as:
• The first letter is the one-letter
abbreviation for the amino acid
being altered.
• The number identifies the
position of the residue in the
primary structure.
⚫ The second letter is the
one-letter abbreviation for the
amino acid replacing the
original one.
• Uncat. refers to the estimated
rate for the
uncatalyzed reaction.
Log₁(S-1)
Wild type
S221A
H64A
-5
D32A
S221A
H64A
D32A
-10
Uncat.
How would the activity of a reaction catalyzed by a version of subtilisin with all three residues in the catalytic triad
mutated compare to the activity of the uncatalyzed reaction?
It would have more activity, because the reaction catalyzed by the triple mutant is approximately three-fold faster
than the uncatalyzed reaction.
It would have less activity, because the reaction catalyzed by the triple mutant is approximately 1000-fold slower
than the…
B
Substrate
Product
AL
Product
Substrate
Reaction progress-
Reaction progress-
omplete the passage describing the two reactions.
In reaction A, the stability of the substrate is
(AG) of the reaction is
positive,
Incorrect Answer
greater than the stability of the product. The free-energy change
Incorrect Answer
so the reaction is considered
In reaction B, the stability of the substrate is
(AG) of the reaction is
less than
Incorrect Answer
endergonic
and
Incorrect Answer
not spontaneous.
Incorrect Answer
the stability of the product. The free-energy change
negative, so the reaction is considered
Incorrect Answer
exergonic
and
spontaneous.
Incorrect Answer
Incorrect Answer
Chapter 22 Solutions
Biochemistry: Concepts and Connections
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- Match the descriptions and compounds with the terms competitive, uncompetitive, and noncompetitive inhibition. Competitive inhibition Uncompetitive inhibition Noncompetitive inhibition Answer Bank inhibitor binds to the enzyme-substrate complex only Vmax remains the same but Ky increases inhibitor and substrate can bind simultaneously lowers Vmax and KM doxycycline sulfanilamide KM remains unchanged, but Vis lower prevents substrate from binding to the active site Rounduparrow_forwardDraw a pentapeptide made of the following amino acids: glycine, tyrosine, lysine, glutamate, and leucine at pH 1, pH 7, and pH 12. Draw the correct stereochemistry for each pentapeptide. Calculate the charge of the three compounds you've drawn and the PI.arrow_forward7. a. Complete the following redox reaction with the missing products NADH H b. Provide an arrow-pushing mechanism for the oxidation reaction. Use the explicit structure of NADH or NAD' as needed. For simplicity, use only the nicotinamide portion of the moleculearrow_forward
- Discuss the differences between eukaryotic and prokaryotic cells with regards to their genetic materials. Including in your discussion the structure and organisation of genetic material, as well as any implications these differences may have on cellular functions and evolution. Rubric Understanding of genetic material differences (provides a comprehensive and accurate explanation of the differences between eukaryotic and prokaryotic cells in terms of their genetic material, including the structure, organisation and function of genetic material in each cell type. Demonstrates a thorough understanding of the topic) Analysis of implications (analyze the differences between eukaryotic and prokaryotic cells in terms of their genetic material with depth and insight, discussing the implications of these differences on cellular functions and evolution. Provides specific examples and explanations.)arrow_forwardWhen was the dihydropyridine calcium channel blocker isradipine first patented and by whom? Please provide information on the origin and history of isradipine and who owns it/manufactures it.arrow_forward9) Below, there is a representation of an SDS-PAGE gel. Assuming the samples in the MW standard have masses of: 66 kDa, 45 kDa, 36 kDa, 29 kDa, 24 kDa, 20.1 kDa, and 14.2 kDa, a) Figure 4: indicate where each of the measurements were taken and label as in II.6. figure 2 above. b) As in II.7. Table 1 above create Table 2 using the data below. Determine the r.f. values for the MW standards, plot the relative mobility versus the log of the mass for the standards, and use the best fit straight line to determine the molecular weights of the proteins in the whey, peak 1, and peak 2 lanes. (5 pts—this will be scaled up appropriately if your gel did not develop properly) dye MW Whey Peak 1 Peak 2arrow_forward
- what are the different classes and some examples of neuroprotectants that can be used to treat, prevent, or combat neurotoxicity/a neurotoxicant...for example, antioxidants, nutraceuticals, etc.,..?arrow_forwardImagine that aldolase can react with the seven carbon molecule Sedoheptulose-1,7-bisphosphate (below). Use the mechanism to predict the two products generated. Please draw out the stereochemistry in a fischer projection.arrow_forwardSodium borohydride (NaBH4) is a potent inhibitor of aldolase. It is known to ONLY inhibit theenzyme when it is complexed with substrate. Treatment of the enzyme alone has no effect.What is the mechanism for this inhibition? Please draw out the mechanism and show how it inhibits this.arrow_forward
- Show the fate of the proton on the 4-Oxygen molecule of F-1,6-BP. Please include a drawing showing the electron flow that occurs.arrow_forward1. Which one is the major organic product obtained from the following aldol condensation? O NaOH, H₂O heat A B C D Earrow_forwardAn organic chemist ordered the wrong item. She wanted to obtain 1-hydroxy-2-butanone, butinstead ordered 2-hydroxybutyraldehyde. As a good biochemist, show how the organic chemistcould use biological catalysis to make her desired compound. Please show the mechanism by drawing.arrow_forward
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