Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 51.2, Problem 1R
Summary Introduction
To review:
The fate of ammonia (formed when amino acids are broken down) in body of a fish and in body of a mammal.
Introduction:
Ammonia is the waste product that is to be removed from the body and since, it is very toxic it cannot be stored in the body of organism and diffusion has to be rapid and continuous. Ammonia is synthesized in all the organisms as nitrogenous wastes. It is formed when amino acids are broken down in the body.
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Which of the following statements is true about amino acids?
a. All twenty (20) of these protein-derived amino acids are a-amino acids, meaning that the amino group is located on the carbon alpha to the carboxyl group.
b. For nineteen (19) of the twenty (20) amino acids, the a-amino group is primary. Glycine is different; its a-amino group is secondary.
c. With the exception of proline, the a-carbon of each amino acid is a chiral center. As shown in Table 27.1, all 19 chiral amino acids have the same relative
d. Both a & c
Shown below are three amino acids:
H.
H.
H--CH,CH,CH, -N.
NH,
H- CHCH,
NH,
Hn,-SH
NH,
ARGININE
ISOLEUCINE
(ile)
CYSTEINE
(arg)
(cys)
Answer the following questions (12-16).
Give two examples of amino acids that are:
Acidic
Basic
Polar
Nonpolar
Chapter 51 Solutions
Life: The Science of Biology
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