Campbell Biology (10th Edition)
10th Edition
ISBN: 9780321775658
Author: Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson
Publisher: PEARSON
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Textbook Question
Chapter 39, Problem 5TYU
Level 2: Application/Analysis
5. The signaling molecule for flowering might be released earlier than usual in a long-day plant exposed to flashes of
- (A) Far-red light during the night.
- (B) red light during the night.
- (C) red light followed by far-red light during the night.
- (D) far-red light during the day.
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Hormones and signal pathways
Complete the following paragraph to describe signal transduction as it occurs within plants. Choices may be used more than once or
not at all.
Chemical signals called
play an important role in a plant's
ability to respond to a stimulus.
These signals bind to receptors, the first step in a cellular response called a
may be located in the plasma membrane, the cytoplasm, the
nucleus, or the endoplasmic reticulum.
The series of relay proteins or enzymes activated by the hormone binding the
receptor make up the
Some responses are immediate,
while others require a
like Ca*, to initiate a cellular
response.
The result of the transduction pathway is a
which is often
the transcription of specific genes, resulting in some measurable change.
hormones
reflex arc
signal transduction
pathway
Signal transducers
second messenger
response
Receptor proteins
first messenger
1.
A) Describe the three steps (Reception, Transduction, Response) of de-etiolation (greening response) signal transduction in plants.
B) Describe a signal transduction (give the stimulus and response) that may occur in humans.
2. Plant cells communicate in a variety of ways to elicit cellular responses. In the figure below the plant is
responding the presence of light with the release of auxin. Auxin was first discovered for its ability to
promote growth in plants. It is a plant hormone that inhibits the lengthening and stimulate the formation of
lateral roots and root hairs.
(a) Describe the plant's response to the presence of light.
(b) Explain the role that auxin has in eliciting the plant's response.
(c) Explain how the behavioral responses of the plant affect their overall fitness.
Chapter 39 Solutions
Campbell Biology (10th Edition)
Ch. 39.1 - What are the morphological differences between...Ch. 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 - Prob. 3CCCh. 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 - MAKE CONNECTIONS Plants detect the quality of...Ch. 39.4 - Prob. 1CC
Ch. 39.4 - Prob. 2CCCh. 39.4 - Prob. 3CCCh. 39.5 - What are some drawbacks of spraying fields with...Ch. 39.5 - Chewing insects mechanically damage plants and...Ch. 39.5 - Many fungal pathogens get food by causing plant...Ch. 39.5 - WHAT IF? Suppose a scientist finds that a...Ch. 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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- Phytochrome is a plant pigment protein that mediates plant infection promotes plant growth mediates morphological changes in response to red and far-red light inhibits plant growtharrow_forwardEXPERIMENT: INITIATION OF CALLUS AND CELL SUSPENSION IN SELECTED PLANTS Please make a general introduction paragraph about this experiment.arrow_forwardGive Detailed explanation Solution (don't give Handwritten answer)arrow_forward
- Predict whether flowering in a short day plant with a minimum critical length of 14 hours would be expected to occur in the following situations. The plant is exposed to 15 hours of daylight and 9 hours of darkness uninterrupted. The plant is exposed to 9 hours of daylight and 15 hours of darkness. The plant is exposed to 9 hours of daylight and 15 hours of darkness, with 10 minutes exposure to red light in the middle of the night.arrow_forward86arrow_forward50. Read the given statements and select the correct option. (i) Darwin and Darwin (1880) found that sensation of unilateral illumination was perceived by the coleoptile tip of canary grass. (i) IAA is universal natural auxin, discovered by Kogl et al. (iii) IBA is both natural and synthetic auxin. (iv) Auxins promote the growth of lateral shoots. (a) Statements (i) and (ii) are correct. (b) Statements (ii) and (iii) are correct. (c) Statements (i), (ii) and (iii) are correct. (d) Statements (i), (ii), (iii) and (iv) are correct.arrow_forward
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