Chemistry for Today: General, Organic, and Biochemistry
9th Edition
ISBN: 9781305960060
Author: Spencer L. Seager, Michael R. Slabaugh, Maren S. Hansen
Publisher: Cengage Learning
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Chapter 19, Problem 19.22E
What special role does the amino acid cysteine have in the peptides vasopressin and oxytocin?
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(a) The following synthesis of the molecule shown in the circle has a major problem. What is this problem? (2
pts)
1) HBr
(no peroxides)
2) H-
NaNH2
Br
3) NaNH,
4) CH3Br
5) H2, Pd
(b) Starting with the molecule shown below and any other materials with two carbons or less, write out an
alternate synthesis of the circled molecule. More than one step is needed. Indicate the reagent(s) and the major
product in all the steps in your synthesis. (5 pts)
2024 Fall Term (1) Organic Chemistry 1 (Lec)
CHEM 22204 02[6386] (Hunter College)
(c) Using the same starting material as in part (b) and any other materials win two carpons or less, write out
syntheses of the circled molecules shown below. More than one step is needed in each case. Indicate the
reagent(s) and the major product in all the steps in your synthesis. You may use reactions and products from
your synthesis in part (b). (5 pts)
alt
ons for
Free Response Questions
FRQ 1:
0/5
To spectrophotometrically determine the mass percent of cobalt in an ore containing cobalt and
some inert materials, solutions with known [Co?) are prepared and absorbance of each of the
solutions is measured at the wavelength of optimum absorbance. The data are used to create a
calibration plot, shown below.
0.90-
0.80-
0.70
0.60
0.50
0.40-
0.30
0.20-
0.10-
0.00-
0.005
0.010
Concentration (M)
0.015
A 0.630 g sample of the ore is completely dissolved in concentrated HNO3(aq). The mixture is diluted
with water to a final volume of 50.00 ml. Assume that all the cobalt in the ore sample is converted to
Co2+(aq).
a. What is the [Co2] in the solution if the absorbance of a sample of the solution is 0.74?
13
✗
b. Calculate the number of moles of Co2+(aq) in the 50.00 mL solution.
0.008 mols Co
Please correct answer and don't used hand raiting
Chapter 19 Solutions
Chemistry for Today: General, Organic, and Biochemistry
Ch. 19 - Draw the structure of hexanoic acid. Label the...Ch. 19 - What functional groups are found in all amino...Ch. 19 - Identify the R group of the side chain in the...Ch. 19 - Prob. 19.4ECh. 19 - Draw structural formulas for the following amino...Ch. 19 - Prob. 19.6ECh. 19 - Draw Fisher projections representing the D and L...Ch. 19 - Draw Fisher projections representing the D and L...Ch. 19 - Prob. 19.9ECh. 19 - What characteristics indicate that amino acids...
Ch. 19 - Prob. 19.11ECh. 19 - Write structural formulas to show the form the...Ch. 19 - Write structural formulas to show the form of the...Ch. 19 - Write ionic equations to show how serine acts as a...Ch. 19 - Write two reactions to represent the formation of...Ch. 19 - Write a complete structural formula and an...Ch. 19 - Write a complete structural formula and an...Ch. 19 - Prob. 19.18ECh. 19 - Write abbreviated formulas for the six isomeric...Ch. 19 - Prob. 19.20ECh. 19 - How many tripeptide isomers that contain one...Ch. 19 - What special role does the amino acid cysteine...Ch. 19 - Prob. 19.23ECh. 19 - Explain why the presence of certain proteins in...Ch. 19 - Prob. 19.25ECh. 19 - Explain why a protein is least soluble in an...Ch. 19 - Prob. 19.27ECh. 19 - Prob. 19.28ECh. 19 - Classify each of the following proteins into one...Ch. 19 - For each of the following two proteins listed in...Ch. 19 - Prob. 19.31ECh. 19 - Differentiate between simple and conjugate...Ch. 19 - Give one example of a conjugated protein that...Ch. 19 - Prob. 19.34ECh. 19 - Prob. 19.35ECh. 19 - Write the structure for a protein backbone. Make...Ch. 19 - Prob. 19.37ECh. 19 - Prob. 19.38ECh. 19 - Prob. 19.39ECh. 19 - Prob. 19.40ECh. 19 - Which amino acids have side-chain groups that can...Ch. 19 - Prob. 19.42ECh. 19 - Prob. 19.43ECh. 19 - A globular protein in aqueous surroundings...Ch. 19 - What is meant by the term quaternary protein...Ch. 19 - What types of forces give rise to quaternary...Ch. 19 - Describe the quaternary protein structure of...Ch. 19 - Prob. 19.48ECh. 19 - Prob. 19.49ECh. 19 - Prob. 19.50ECh. 19 - As fish is cooked, the tissue changes from a soft...Ch. 19 - Prob. 19.52ECh. 19 - Prob. 19.53ECh. 19 - Once cooked, egg whites remain in a solid form....Ch. 19 - Prob. 19.55ECh. 19 - Prob. 19.56ECh. 19 - A protein has a molecular weight of about 12,000u....Ch. 19 - Which amino acids could be referred to as...Ch. 19 - Prob. 19.59ECh. 19 - Prob. 19.60ECh. 19 - Prob. 19.61ECh. 19 - Some researchers feel that the high experienced by...Ch. 19 - Prob. 19.63ECh. 19 - Prob. 19.64ECh. 19 - Prob. 19.65ECh. 19 - Prob. 19.66ECh. 19 - Why must the protein drug insulin be given by...Ch. 19 - Prob. 19.68ECh. 19 - Prob. 19.69ECh. 19 - Prob. 19.70ECh. 19 - Prob. 19.71ECh. 19 - What functional groups are found in all amino...Ch. 19 - Which of the following are true concerning the...Ch. 19 - Rank the following components of hemoglobin in...Ch. 19 - Describe the quaternary protein structure of...Ch. 19 - Complete degradation of a protein into individual...Ch. 19 - Which is NOT a characteristic of proteins? a. They...Ch. 19 - Which of the following describes the primary...
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