Introduction to General, Organic and Biochemistry
11th Edition
ISBN: 9781285869759
Author: Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar Torres
Publisher: Cengage Learning
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Chapter 22, Problem 22.61P
22-61 Polyglutamic acid (a polypeptide chain made only of glutamic acid residues) has an a-helix conformation below pH 6.0 and a random-coil conformation above pH 6.0. What is the reason for this conformational change?
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The table includes macrostates characterized by 4 energy levels (&) that are
equally spaced but with different degrees of occupation.
a) Calculate the energy of all the macrostates (in joules). See if they all have
the same energy and number of particles.
b) Calculate the macrostate that is most likely to exist. For this macrostate,
show that the population of the levels is consistent with the Boltzmann
distribution.
macrostate 1 macrostate 2 macrostate 3
ε/k (K) Populations
Populations
Populations
300
5
3
4
200
7
9
8
100
15
17
16
0
33
31
32
DATO: k = 1,38×10-23 J K-1
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In an experiment, the viscosity of water was measured at different
temperatures and the table was constructed from the data obtained.
a) Calculate the activation energy of viscous flow (kJ/mol).
b) Calculate the viscosity at 30°C.
T/°C
0
20
40
60
80
η/cpoise 1,972 1,005 0,656 0,469 0,356
Chapter 22 Solutions
Introduction to General, Organic and Biochemistry
Ch. 22.4 - Problem 22-1 Show how to form the dipeptide...Ch. 22.10 - Problem 22-2 What is the oxidation number (the...Ch. 22.10 - Prob. 22.3PCh. 22.11 - Prob. 22.4PCh. 22 - 22-5 What are the functions of (a) ovalbumin and...Ch. 22 - 22-6 The members of which class of proteins are...Ch. 22 - 22-7 What is the function of an immunoglobulin?Ch. 22 - Prob. 22.8PCh. 22 - 22-9 What is the difference in structure between...Ch. 22 - 22-10 Classify the following amino acids as...
Ch. 22 - 22-11 Which amino acid has the highest percentage...Ch. 22 - Prob. 22.12PCh. 22 - Prob. 22.13PCh. 22 - Prob. 22.14PCh. 22 - Prob. 22.15PCh. 22 - 22-16 Which amino acids in Table 22-1 have more...Ch. 22 - 22-17 What are the similarities and differences in...Ch. 22 - 22-18 Draw the structures of L- and D-valine.Ch. 22 - Prob. 22.19PCh. 22 - 22-20 Show how alanine, in solution at its...Ch. 22 - 22-21 Explain why an amino acid cannot exist in an...Ch. 22 - 22-22 Draw the structure of valine at pH 1 and at...Ch. 22 - Prob. 22.23PCh. 22 - 22-24 Draw the most predominant form of histidine...Ch. 22 - 22-25 Draw the most predominant form of lysine at...Ch. 22 - Prob. 22.26PCh. 22 - 22-27 Show by chemical equations how alanine and...Ch. 22 - 22-28 A tetrapeptide is abbreviated as DPKH. Which...Ch. 22 - 22-29 Draw the structure of a tripeptide made of...Ch. 22 - 22-30 (a) Use the three-letter abbreviations to...Ch. 22 - 22-31 A polypeptide chain is made of alternating...Ch. 22 - Prob. 22.32PCh. 22 - 22-33 Which of the three functional groups on...Ch. 22 - Prob. 22.34PCh. 22 - 22-35 Why is histidine considered a basic amino...Ch. 22 - Prob. 22.36PCh. 22 - Prob. 22.37PCh. 22 - 22-38 Why does proline not absorb light at 280 nm?Ch. 22 - Prob. 22.39PCh. 22 - Prob. 22.40PCh. 22 - Prob. 22.41PCh. 22 - 22-42 (a) How many atoms of the peptide bond lie...Ch. 22 - 22-43 (a) Draw the structural formula of the...Ch. 22 - 22-44 How can a protein act as a buffer?Ch. 22 - 22-45 Proteins are least soluble at their...Ch. 22 - 22-46 How many different tripeptides can be made...Ch. 22 - 22-47 How many different tetrapeptides can be made...Ch. 22 - 22-48 How many amino acid residues in the A chain...Ch. 22 - 22-49 Based on your knowledge of the chemical...Ch. 22 - 22-50 Is a random coil a (a) primary, (b)...Ch. 22 - 22-51 Decide whether the following structures that...Ch. 22 - Prob. 22.52PCh. 22 - 22-53 Do iron and zinc ions play role in protein...Ch. 22 - Prob. 22.54PCh. 22 - 22-55 Consider the coordination compound Fe(CO)5...Ch. 22 - Prob. 22.56PCh. 22 - 22-57 Consider the coordination compound...Ch. 22 - Prob. 22.58PCh. 22 - 22-59 What is the effect of salt bridges on the...Ch. 22 - Prob. 22.60PCh. 22 - 22-61 Polyglutamic acid (a polypeptide chain made...Ch. 22 - 22-62 Distinguish between intermolecular and...Ch. 22 - 22-63 Identify the primary, secondary, and...Ch. 22 - 22-64 If both cysteine residues on the B chain of...Ch. 22 - 22-65 (a) What is the difference in the quaternary...Ch. 22 - Prob. 22.66PCh. 22 - Prob. 22.67PCh. 22 - Prob. 22.68PCh. 22 - Prob. 22.69PCh. 22 - Prob. 22.70PCh. 22 - 22-71 Which amino acid side chain is most...Ch. 22 - 22-72 What does the reducing agent do in...Ch. 22 - 22-73 Silver nitrate is sometimes put into the...Ch. 22 - 22-74 Why do nurses and physicians use 70% alcohol...Ch. 22 - 22-75 (Chemical Connections 22A) Why must some...Ch. 22 - Prob. 22.76PCh. 22 - Prob. 22.77PCh. 22 - Prob. 22.78PCh. 22 - Prob. 22.79PCh. 22 - Prob. 22.80PCh. 22 - Prob. 22.81PCh. 22 - 22-82 (Chemical Connections 22H) How does the...Ch. 22 - Prob. 22.83PCh. 22 - 22-84 How many different dipeptides can be made...Ch. 22 - 22-85 Denaturation is usually associated with...Ch. 22 - Prob. 22.86PCh. 22 - Prob. 22.87PCh. 22 - Prob. 22.88PCh. 22 - 22-89 What kind of noncovalent interaction occurs...Ch. 22 - Prob. 22.90PCh. 22 - 22-91 Which amino acid does not rotate the plane...Ch. 22 - 22-92 Write the expected products of the acid...Ch. 22 - 22-93 What charges are on aspartic acid at pH 2.0?Ch. 22 - Prob. 22.94PCh. 22 - Prob. 22.95PCh. 22 - Prob. 22.96PCh. 22 - 22-97 Gelatin is derived from collagen by...Ch. 22 - Prob. 22.98PCh. 22 - Prob. 22.99PCh. 22 - Prob. 22.100PCh. 22 - 22-101 Using what you know about protein...Ch. 22 - Prob. 22.102PCh. 22 - Prob. 22.103PCh. 22 - 22-104 Why is collagen not a very good source of...Ch. 22 - Prob. 22.105P
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- A laser emits a line at 632.8 nm. If the cavity is 12 cm long, how many modes oscillate in the cavity? How long does it take for the radiation to travel the entire cavity? What is the frequency difference between 2 consecutive modes?(refractive index of the medium n = 1).arrow_forwardThe number of microstates corresponding to each macrostate is given by N. The dominant macrostate or configuration of a system is the macrostate with the greatest weight W. Are both statements correct?arrow_forwardFor the single step reaction: A + B → 2C + 25 kJ If the activation energy for this reaction is 35.8 kJ, sketch an energy vs. reaction coordinate diagram for this reaction. Be sure to label the following on your diagram: each of the axes, reactant compounds and product compounds, enthalpy of reaction, activation energy of the forward reaction with the correct value, activation energy of the backwards reaction with the correct value and the transition state. In the same sketch you drew, after the addition of a homogeneous catalyst, show how it would change the graph. Label any new line "catalyst" and label any new activation energy.arrow_forward
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