Biochemistry
8th Edition
ISBN: 9781285429106
Author: Campbell, Mary K., FARRELL, Shawn O.
Publisher: Cengage Learning,
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Chapter 4, Problem 9RE
RECALL List three major differences between fibrous and globular proteins.
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1. (10 points) Pulverized coal pellets, which may be
°
approximated as carbon spheres of radius r = 1 mm, are
burned in a pure oxygen atmosphere at 1450 K and 1 atm.
Oxygen is transferred to the particle surface by diffusion, where
it is consumed in the reaction C + O₂ →> CO₂. The reaction rate
is first order and of the form No2 = k₁C₁₂(r), where k₁ = 0.1 m/s.
Neglecting changes in r, determine the steady-state O₂ molar
consumption rate in kmol/s. At 1450 K, the binary diffusion
coefficient for O2 and CO2 is 1.71 x 10ª m²/s.
2. (20 points) Consider combustion of hydrogen gas in a mixture
of hydrogen and oxygen adjacent to the metal wall of a
combustion chamber. Combustion occurs at constant
temperature and pressure according to the chemical reaction
2H₂+ O₂→ 2H₂O. Measurements under steady-state conditions
at 10 mm from the wall indicate that the molar concentrations
of hydrogen, oxygen, and water vapor are 0.10, 0.10, and 0.20
kmol/m³, respectively. The generation rate of water vapor is
0.96x102 kmol/m³s throughout the region of interest. The binary
diffusion coefficient for each of the species (H, O̟, and H₂O) in
the remaining species is 0.6 X 10-5 m²/s.
(a) Determine an expression for and make a qualitative plot
of C as a function of distance from the wall.
H2
(b) Determine the value of C2 at the wall.
H2
(c) On the same coordinates used in part (a), sketch curves
for the concentrations of oxygen and water vapor. This will
require you to calculate Co, and C.
02
H20
(d) What is the molar flux of water…
4. (15 points) Consider a spherical organism of radius ro within
which respiration occurs at a uniform volumetric rate of That is,
oxygen (species A) consumption is governed by a first- order
reaction, homogeneous chemical reaction.
a. If a molar concentration of CA(ro) = CA,o is maintained at
the surface of the organism, obtain an expression for the
radial distribution of oxygen, CA(r), within the organism.
Hint: To simplify solution of the species diffusion equation,
invoke the transformation y = rCA.
b. Obtain an expression for the rate of oxygen consumption
within the organism.
c. Consider an organism of radius ro = 0.10 mm and a
diffusion coefficient of DAB = 108 m2/s. If CA, o = 5 x105
kmol/m3 and k1 20 s1, estimate the corresponding value
of the molar concentration at the center of the organism.
What is the rate of oxygen consumption by the organism?
Chapter 4 Solutions
Biochemistry
Ch. 4 - RECALL Match the following statements about...Ch. 4 - RECALL Define denaturation in terms of the effects...Ch. 4 - RECALL What is the nature of random structure in...Ch. 4 - REFLECT AND APPLY Suggest an explanation for the...Ch. 4 - REFLECT AND APPLY Rationalize the following...Ch. 4 - REFLECT AND APPLY Glycine is a highly conserved...Ch. 4 - REFLECT AND APPLY A mutation that changes an...Ch. 4 - REFLECT AND APPLY A biochemistry student...Ch. 4 - RECALL List three major differences between...Ch. 4 - RECALL What are Ramachandran angles?
Ch. 4 - Prob. 11RECh. 4 - Prob. 12RECh. 4 - RECALL List some of the differences between the...Ch. 4 - RECALL List some of the possible combinations of...Ch. 4 - RECALL Why is proline frequently encountered at...Ch. 4 - RECALL Why must glycine be found at regular...Ch. 4 - REFLECT AND APPLY You hear the comment that the...Ch. 4 - REFLECT AND APPLY Woolen clothing shrinks when...Ch. 4 - RECALL Draw two hydrogen bonds, one that is part...Ch. 4 - RECALL Draw a possible electrostatic interaction...Ch. 4 - RECALL Draw a disulfide bridge between two...Ch. 4 - RECALL Draw a region of a polypeptide chain...Ch. 4 - REFLECT AND APPLY The terms configuration and...Ch. 4 - REFLECT AND APPLY Theoretically, a protein could...Ch. 4 - REFLECT AND APPLY What is the highest level of...Ch. 4 - RECALL List two similarities and two differences...Ch. 4 - RECALL What are the two critical amino acids near...Ch. 4 - RECALL What is the highest level of organization...Ch. 4 - RECALL Suggest a way in which the difference...Ch. 4 - RECALL Describe the Bohr effect.Ch. 4 - RECALL Describe the effect of 2,...Ch. 4 - RECALL How does the oxygen-binding curve of fetal...Ch. 4 - RECALL What is the critical amino acid difference...Ch. 4 - REFLECT AND APPLY In oxygenated hemoglobin,...Ch. 4 - REFLECT AND APPLY You are studying with a friend...Ch. 4 - REFLECT AND APPLY How does the difference between...Ch. 4 - REFLECT AND APPLY Suggest a reason for the...Ch. 4 - Prob. 38RECh. 4 - REFLECT AND APPLY Why is fetal Hb essential for...Ch. 4 - BIOCHEMICAL CONNECTIONS Why might you expect to...Ch. 4 - REFLECT AND APPLY When deoxyhemoglobin was first...Ch. 4 - BIOCHEMICAL CONNECTIONS What is the direct cause...Ch. 4 - BIOCHEMICAL CONNECTIONS What is the effect of the...Ch. 4 - BIOCHEMICAL CONNECTIONS Why do scientists believe...Ch. 4 - Prob. 45RECh. 4 - BIOCHEMICAL CONNECTIONS What is BCL11A and how is...Ch. 4 - BIOCHEMICAL CONNECTIONS Given the purpose of...Ch. 4 - Prob. 48RECh. 4 - REFLECT AND APPLY Comment on the energetics of...Ch. 4 - RECALL What is a chaperone?Ch. 4 - Prob. 52RECh. 4 - Prob. 53RECh. 4 - Prob. 54RECh. 4 - RECALL What are some diseases caused by misfolded...Ch. 4 - RECALL What causes protein aggregates to form?Ch. 4 - Prob. 57RECh. 4 - Prob. 58RECh. 4 - Prob. 59RECh. 4 - BIOCHEMICAL CONNECTIONS What aspects of the...Ch. 4 - Prob. 61RECh. 4 - Prob. 62RECh. 4 - Prob. 63RECh. 4 - Prob. 64RECh. 4 - Prob. 65RECh. 4 - Prob. 66RE
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