FUNDAMENTALS OF BIOCHEMISTRY-ACCESS
5th Edition
ISBN: 9781119498742
Author: Voet
Publisher: WILEY
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Chapter 12, Problem 7E
Summary Introduction
To draw: Curves for an enzymatic reaction that shows the appropriate relations between the variables in the given plot.
Concept introduction: Enzymes are proteins that alter the
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Students have asked these similar questions
From the reaction data below, determine whether the reaction is first order or second order and calculate the rate constant.
Time (s)
0
Reactant (mM)
5.4
1
4.6
2
3.9
3
3.2
4
2.7
5
2.3
Only a plot of In[reactant] versus t gives a straight line, so the reaction is
first order
. The negative of the slope, k, is
0.171
Hair grows at a rate of about 20 cm/yr. All this growth is concentrated at the base of the hair fiber, where a-keratin filaments are
synthesized inside living epidermal cells and assembled into ropelike structures.
Two-chan
14
Protofilament
20-30 A
Two-chain
Intermediate
flament
-Protob
Protofilament
Cross section of a hair
The fundamental structural element of a keratin is the a helix, which has 3.6 amino acid residues per turn and a rise of 5.4 A
perlum.
54A
(36)
Amino terminus
Carbon
Hydrogen
Oxygen
Nitrogen
group
Carboxyl terminus
Assuming that the biosynthesis of a helical keratin chains is the rate-limiting factor in the growth of hair, calculate the rate at
which peptide bonds of a-keratin chains must be synthesized (peptide bonds per second) to account for the observed yearly
growth of hair.
0422
rate of peptide bond formation:
Income
bonds/s
Specific rotation is a measure of a solution's capacity to rotate circularly polarized light. The unfolding of the a helix of a
polypeptide to a random conformation is accompanied by a large decrease in specific rotation.
Polyglutamate, a polypeptide made up of only 1-Glu residues, has the a helix conformation at pH 3. When researchers raise the
pH to 7, there is a large decrease in the specific rotation of the solution. Similarly, polylysine (1.-Lys residues) is an a helix at pH
10, but when researchers lower the pH to 7 the specific rotation also decreases, as shown in the graph.
a Helix
Specific rotation
Poly(Glu)
a Helix
Random
conformation
Poly(Lys)
Random conformation
T
+
°
2
4
6 В
10 12 14
PH
Complete the statements about the molecular mechanism for these changes in specific rotation.
Increasing the pH of a polyglutamate solution from 6 to 7 causes the carboxyl group of each glutamate residue
Comed Artwer
lose a proton. The negatively charged groups in each glutamate residue…
Chapter 12 Solutions
FUNDAMENTALS OF BIOCHEMISTRY-ACCESS
Ch. 12 - Prob. 1ECh. 12 - Prob. 2ECh. 12 - Prob. 3ECh. 12 - Prob. 4ECh. 12 - 5. From the reaction data below, determine whether...Ch. 12 - Prob. 6ECh. 12 - 7. For an enzymatic reaction, draw curves that...Ch. 12 - 8. Explain why it is usually easier to calculate...Ch. 12 - Prob. 9ECh. 12 - 10. Identify the enzymes in Table 12-1 whose...
Ch. 12 - 11. Calculate KM and Vmax from the following...Ch. 12 - 12. Explain why each of the following data sets...Ch. 12 - 13. The KM for the reaction of chymotrypsin with...Ch. 12 - 14. Enzyme A catalyzes the reaction S ? P and has...Ch. 12 - 15. In a bisubstrute reaction, a small amount of...Ch. 12 - 16. In a bisubstrate reaction, a small amount of...Ch. 12 - Prob. 17ECh. 12 - 18. Molecule A is the substrate for enzyme X....Ch. 12 - 19. Determine the type of inhibition of an...Ch. 12 - 20. Estimate KI for a competitive inhibitor when...Ch. 12 - Prob. 21CQCh. 12 - 22 Is it necessary to know [E]T to determine (a)...Ch. 12 - 23. You are trying to determine the KM for an...Ch. 12 - 24. You are attempting to determine KM by...Ch. 12 - Prob. 25CQCh. 12 - 26. Enzyme X and enzyme Y catalyze the same...Ch. 12 - 27. Based on some preliminary measurements, you...Ch. 12 - 28. For the same enzyme sample described in...Ch. 12 - 29. For an enzyme catalyzed reaction, the presence...Ch. 12 - 30. Sphingosine-1-phosphate (S1P) is important for...Ch. 12 - 31. Ethanol in the body is oxidized to...Ch. 12 - Prob. 32CQCh. 12 - MORE TO EXPLORE What kind of inhibitor is...
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- From the reaction data below, determine whether the reaction is first order or second order and calculate the rate constant. Time (s) 0 Reactant (mM) 6.2 1 3.1 2 2.1 3 1.6 4 1.3 5 1.1 Only a plot of 1/[reactant] versus t gives a straight line, so the reaction is 0.150 mM-1 s-1 . S second order . The slope, k, isarrow_forwardFrom the reaction data below, determine whether the reaction is first order or second order and calculate the rate constant. Time (s) 0 Reactant (mM) 5.4 1 4.6 2 3.9 3 3.2 4 2.7 5 2.3 Only a plot of In[reactant] versus t gives a straight line, so the reaction is s-1. . The negative of the slope, k, isarrow_forwardA protein has a molecular mass of 400 kDa when measured by size-exclusion chromatography. When subjected to gel electrophoresis in the presence of sodium dodecyl sulfate (SDS), the protein gives three bands with molecular masses of 180, 160, and 60 kDa. When electrophoresis is carried out in the presence of SDS and dithiothreitol (DTT), three bands again form, this time with molecular masses of 160, 90, and 60 kDa. How many subunits does the protein have, and what is the molecular mass of each? four subunits: 180, 160, 90, and 60 kDa three subunits: 180, 160, and 60 kDa three subunits: 160, 90, and 60 kDa four subunits: 160, 90, 90, and 60 kDa Correct Answerarrow_forward
- Calculate KM and Vmax from the following data: KM= i Vmax [S] (μM) vo (mM.s-¹) 0.1 0.34 0.2 0.53 0.4 0.74 0.8 0.91 1.6 1.04 μM mM s-1arrow_forwardPropose a detailed chemical mechanism for the enzyme catalyzed reaction below and briefly note similarities, if any, to enzymes that we've studied. CO2 + CO2 2 CO2 HO CH3arrow_forwardState and describe the four stages of protein formation, please include the types of bonds at each stage.arrow_forward
- Please state and describe the four different types of non-covalent interactions.arrow_forwardPls help with these three questionsarrow_forward11. Which of the compounds below is the major product of the following reaction sequence? NOTE: PCC is pyridinium chlorochromate 1. BH 3 PCC 2. H2O2, NaOH NH HN ΗΝ, A B C CH3NH2, NaBH3CN D E NHarrow_forward
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