EBK BIOLOGY
10th Edition
ISBN: 8220100474729
Author: Martin
Publisher: Cengage Learning US
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Textbook Question
Chapter 3, Problem 12TYU
PREDICT Do any of the amino acid side groups shown below have the potential to form an ionic bond with any of the other side groups shown? If so, which pair(s) could form such an association?
(a) —CH3
(b) —CH2 — COO—
(c) —CH2 — CH2 — NH3+
(d) —CH2 — CH2 — COO—
(e) —CH2 — OH
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Students have asked these similar questions
Φ and ψ in the Ramachandran plot (below) are:
a) Rotational angles around the bond between the α-carbon and N-H (Φ) and C=O (ψ).
b) Amino acid solubility in octanol (Φ) and water (ψ).
c) Hydrogen bond angles in α-helices (Φ) and β-sheets (ψ).
d) Amino acid solubility in water (Φ) and octanol (ψ).
As you increase the number of alanine residues in the oligopeptide chain:
The pKas of the carboxylate groups will [increase, decrease, stay the same]
The pKas of the amino groups will [increase, decrease, stay the same]
The amino acid arginine ionizes according to the following scheme:
NH,
NH2
NH2
H
NH,
C=N
C=N
C=N
C=N-H
pk = 2.17
-H
pK. = 8.99
-H
pK = 125
-H*
H.
NH
NH
NH
NH
H (CH,)a
H (CH),
+H*
(CH)a
(CH,)a
H,N-C-coo-
+H*
+H*
H-N*-C-COOH
H-N-C-Co-
H,N-C-co-
H.
нн
H.
H
II
II
IV
(a) Calculate the isoelectric point of arginine. You can neglect contributions
from form I. Why?
(b) Calculate the average charge on arginine when pH = 9.20. (Hìnt: Find
the average charge for each ionizable group and sum these together.)
(c) Is the value of average charge you calculated in part b reasonable, given
the pl you calculated in part a? Explain your answer.
Chapter 3 Solutions
EBK BIOLOGY
Ch. 3.1 - Describe the properties of carbon that make it the...Ch. 3.1 - Define the term isomer and distinguish among the...Ch. 3.1 - Identify the major functional groups present in...Ch. 3.1 - Explain the relationship between polymers and...Ch. 3.1 - What are some of the ways that the features of...Ch. 3.1 - Prob. 2CCh. 3.1 - Prob. 3CCh. 3.1 - Prob. 4CCh. 3.1 - Prob. 5CCh. 3.2 - Distinguish among monosaccharides, disaccharides,...
Ch. 3.2 - Prob. 1CCh. 3.3 - Distinguish among fats, phospholipids, and...Ch. 3.3 - Prob. 1CCh. 3.3 - Explain why the structure of phospholipids enables...Ch. 3.4 - Give an overall description of the structure and...Ch. 3.4 - Prob. 8LOCh. 3.4 - Distinguish among the four levels of organization...Ch. 3.4 - Prob. 1CCh. 3.4 - Prob. 2CCh. 3.5 - Describe the components of a nucleotide. Name some...Ch. 3.5 - VISUALIZE Sketch a pyrimidine nucleotide subunit...Ch. 3.6 - Compare the functions and chemical compositions of...Ch. 3.6 - How can you distinguish a pentose sugar from a...Ch. 3 - Prob. 1TYUCh. 3 - VISUALIZE The structures depicted are (a)...Ch. 3 - Prob. 3TYUCh. 3 - The synthetic process by which monomers are...Ch. 3 - A monosaccharide designated as an aldehyde sugar...Ch. 3 - Structural polysaccharides typically (a) have...Ch. 3 - Saturated fatty acids are so named because they...Ch. 3 - Fatty acids in phospholipids and triacylglycerols...Ch. 3 - Which of the following levels of protein structure...Ch. 3 - Which of the following associations between R...Ch. 3 - Each phosphodiester linkage in DNA or RNA includes...Ch. 3 - PREDICT Do any of the amino acid side groups shown...Ch. 3 - PREDICT Like oxygen, sulfur forms two covalent...Ch. 3 - Hydrogen bonds and van der Waals interactions are...Ch. 3 - EVOLUTION LINK In what ways are all species alike...Ch. 3 - EVOLUTION LINK The total number of possible amino...Ch. 3 - EVOLUTION LINK Each amino acid could potentially...
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