Campbell Biology
12th Edition
ISBN: 9780135188743
Author: Urry
Publisher: PEARSON
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Chapter 39, Problem 2TYU
Summary Introduction
Introduction: Gibberellic acid (GA) is a plant hormone that is mainly responsible for seed germination, promotes shoot growth, and cell elongation, and is also helpful in inducing the flowering of plants. The most widely used gibberellic acid is GA3.
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Assume that two pigments, red and bluc, mix to give the normal purple color of petunia petals. Separate biochemical pathways
synthesize the two pigments, as shown in pathways I and Il in the accompanying diagram. "White" refers to compounds that are
not pigments (total lack of pigment results in a white petal). Red pigment forms from a yellow intermediate that is normally at a
concentration loo kow to color petals. Bluc mixed with yellow makes green. Assume that no mutations are lethal.
Pathway I..
White
Blue
Pathway I White,
Yellow
Red
Pathway II
White,
White,
A third pathway, whose compoundk do not contribute pelal pigmentation, normally docs not allfect the bluc and red pathways.
However, if one of its intermediates (white3) should build up in concentration, it can be converted into the ycllow intermediate of
the red pathway. In the diagram, the letiers A through E represent enzymes. The enzymes' correspoonding genes, all of which are
unlinked, may be symbolized by the same letters.…
Refer to the figure. Portions of three biosynthetic pathways regulated through feedback inhibition and activation are shown.
Two of these pathways intersect at carbamoyl phosphate. The third pathway generates a product that activates production of
carbamoyl phosphate through allosteric modification of the enzyme carbamoyl phosphate synthetase.
Arginine
pathway
Pyrimidine
pathway
Glutamate
СТР
Purine
pathway
N-acetylglutamate
synthetase
N-acetylglutamate
UMP
UMP
ATCase
Ornithine
СР
CO, + ATP
Carbamoyl
phosphate
synthetase
+ Gin
t-Arginine
In this set of pathways, arginine biosynthesis is shut down through feedback inhibition when
and arginine reach
high levels of concentration.
О СТР
O ornithine
O UMP
O carbamoyl phosphate
O glutamate
Drag the terms on the left to the appropriate blanks on the right to complete the sentences. Terms can be used once, more than once, or not at all.
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dCTP
GMP
AMP
GTP
dTTP
activation
inhibition
dGTP
My Answers Give Up
UTP + Gln + ATP → CTP + Glu+ ADP + P₁. Cofactor:
dCMP + H₂O →→→→DUMP + NH3. Cofactor:
CDP+ [2H] → dCDP+ H₂O. Cofactor:
Effect:
Effect:
Effect:
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Chapter 39 Solutions
Campbell Biology
Ch. 39.1 - Prob. 1CCCh. 39.1 - Cycloheximide is a drug that inhibits protein...Ch. 39.1 - Prob. 3CCCh. 39.2 - Prob. 1CCCh. 39.2 - WHAT IF? If a plant has the double mutation err...Ch. 39.2 - MAKE CONNECTIONS What type of feedback process is...Ch. 39.3 - If an enzyme in field-grown soybean leaves is most...Ch. 39.3 - WHAT IF? If a plant flowers in a controlled...Ch. 39.3 - Prob. 3CCCh. 39.4 - Prob. 1CC
Ch. 39.4 - Prob. 2CCCh. 39.4 - Prob. 3CCCh. 39.5 - Prob. 1CCCh. 39.5 - Chewing insects mechanically damage plants and...Ch. 39.5 - Many fungal pathogens get food by causing plant...Ch. 39.5 - Prob. 4CCCh. 39 - What are two common ways by which signal...Ch. 39 - Is there any truth to the old adage, "One bad...Ch. 39 - Why did plant physiologists propose the existence...Ch. 39 - Plants that have acclimated to drought stress are...Ch. 39 - Prob. 39.5CRCh. 39 - Prob. 1TYUCh. 39 - Prob. 2TYUCh. 39 - Prob. 3TYUCh. 39 - How may a plant respond to severe heat stress? (A)...Ch. 39 - Level 2: Application/Analysis 5. The signaling...Ch. 39 - If a long-day plant has a critical night length of...Ch. 39 - Prob. 7TYUCh. 39 - DRAW IT Indicate the response to each condition by...Ch. 39 - Level 3: Synthesis/Evaluation 9. EVOLUTION...Ch. 39 - SCIENTIFIC INQUIRY A plant biologist observed a...Ch. 39 - SCIENCE. TECHNOLOGY, AND SOCIETY Describe how our...Ch. 39 - Prob. 12TYUCh. 39 - Prob. 13TYU
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