Campbell Biology in Focus
3rd Edition
ISBN: 9780134710679
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Rebecca Orr
Publisher: PEARSON
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Question
Chapter 3.1, Problem 4CC
Summary Introduction
To draw:
The structure where, from a cysteine molecule, the NH2 group is replaced with a COOH (carboxyl) group. Also, determine how this change would alter the chemical properties and state whether the central carbon atomis asymmetric after or before the alteration.
Concept introduction:
Amino acids are the molecules that are organic and consist of both the carboxyl and amino groups.
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Draw the structures of L-Cysteine from highly protonated to depronated form. Note Structure A as the most protonated form. Provide the charge of each structure.
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The figure below illustrates the molecular structures of two fatty acids.
A
B
H₂C
The structural formula of erucic acid and behenic acid
с
H₂C
D
erucic acid
behenic acid
Which of the following best explains why erucic acid is liquid at room temperature but behenic acid is solid at
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O
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The presence of a double carbon to carbon bond in erucic acid prevents the molecule
from packing closely together.
The lack of any double carbon-carbon bonds in behenic acid causes the molecule to be
come polar and therefore packed more tightly.
The larger number of carbon atoms in erucic acid prevents the molecule from packing
tightly together.
OH
The smaller number of carbon atoms in behenic acid creates stronger covalent bonds
between the carbon atoms allowing for them to pack more tightly together.
Consider the following Newman projection:
CH3
Br
CH3
Br
Br
What word or two-word phrase describes this conformation?
How many Br atoms are eclipsed by the CH3 group on the front carbon?
How many CH3 groups are gauche to the CH3 group on the front carbon?
How many Br atoms are anti to the CH3 group on the front carbon?
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Chapter 3 Solutions
Campbell Biology in Focus
Ch. 3.1 - How are gasoline and fat chemically similar?Ch. 3.1 - Which molecules in Figure 3.4a re isomers? For...Ch. 3.1 - Prob. 3CCCh. 3.1 - Prob. 4CCCh. 3.2 - How many molecules of water are needed to...Ch. 3.2 - WHAT IF? Suppose you eat a serving of fish. What...Ch. 3.3 - Write the formula for a monosaccharide that has...Ch. 3.3 - A dehydration reaction joins two glucose molecules...Ch. 3.3 - WHAT IF? After a cow is given antibiotics to treat...Ch. 3.4 - Compare the structure of a fat (triglyceride) with...
Ch. 3.4 - Why are human sex hormones considered lipids?Ch. 3.4 - Prob. 3CCCh. 3.5 - Why does a denatured protein no longer function...Ch. 3.5 - What parts of a polypeptide participate in the...Ch. 3.5 - WHAT IF? Where would you expect a polypeptide...Ch. 3.6 - DRAW IT Go to Figure 3.27a and, for the top three...Ch. 3.6 - Prob. 2CCCh. 3.7 - How would sequencing the entire genome of an...Ch. 3.7 - Given the function of DNA, why would you expect...Ch. 3 - Which functional group is not present in this...Ch. 3 - MAKE CONNECTIONS Which chemical group is most...Ch. 3 - Prob. 3TYUCh. 3 - Which of the following statements concerning...Ch. 3 - Prob. 5TYUCh. 3 - The structural level of a protein least a fleeted...Ch. 3 - Enzymes that break down DNA catalyze the...Ch. 3 - Prob. 8TYUCh. 3 - The molecular formula for glucose is C6H12O6. What...Ch. 3 - Construct a table that organizes the following...Ch. 3 - Prob. 11TYUCh. 3 - Prob. 12TYUCh. 3 - FOCUS ON ORGANIZATION Proteins, which have diverse...Ch. 3 - Prob. 14TYUCh. 3 - SYNTHESIZE YOUR KNOWLEDGE Given that the function...
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