Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 39.4, Problem 5CC
Summary Introduction
To predict: The model that explains the functioning of guard cells in forming stomata.
Introduction: The plant leaf consists of abundant of stomata that help the plant in gaseous exchange. The stomata perform transpiration which is the evaporative loss of water in the form of droplets from the surface of the leaves. It helps in cooling the plant and transportation of the water and minerals throughout the plant body.
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Chemotaxis is a process by which cells migrate toward higher concentrations of a signaling molecule. The signaling molecule binds cell-surface receptors that result in actin polymerization at the cell membrane. Actin polymerization results in the formulation of filamentous actin that exerts a force and leads to protrusion of the leading edge. A researcher tested Compound A on chemotaxing cells and measured the relative amount of filamentous actin found in the cells at different times.
Use the EGF Pathway passage to answer the questions.
Part A
Which of these structures, if present in a prokaryote, would prevent the organism from using this type of actin polymerization to chemotax toward a signal?
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D. ribosome
Part B
In the model proposed, which of these events MOST likely occurs to facilitate chemotaxis?
A. Integrins anchor the cell to extracellular components.
B. Motor proteins move actin toward the leading edge.
C. Mitochondria migrate…
Chemotaxis is a process by which cells migrate toward higher concentrations of a signaling molecule. The signaling molecule binds cell-surface receptors that result in actin polymerization at the cell membrane. Actin polymerization results in the formulation of filamentous actin that exerts a force and leads to protrusion of the leading edge. A researcher tested Compound A on chemotaxing cells and measured the relative amount of filamentous actin found in the cells at different times.
Use the EGF Pathway passage to answer the questions.
Part B
In the model proposed, which of these events MOST likely occurs to facilitate chemotaxis?
A. Integrins anchor the cell to extracellular components.
B. Motor proteins move actin toward the leading edge.
C. Mitochondria migrate away from the leading edge.
D. Desmosomes anchor the cell to other cells.
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Lectins are proteins or glycoproteins that cause cells with suitable surface receptors to stick or clump together. Clumping depends on cell and lectin numbers in proper ratios. Why would little or no cell clumping occur if lectin numbers are too low with respect to cell numbers or too high with respect to cell numbers?
Chapter 39 Solutions
Biology
Ch. 39.2 - Describe the direction of water movement when a...Ch. 39.3 - Prob. 1CSCh. 39.4 - Prob. 1CSCh. 39.4 - Prob. 1CCCh. 39.4 - Prob. 2CCCh. 39.4 - Prob. 3CCCh. 39.4 - Prob. 4CCCh. 39.4 - Prob. 5CCCh. 39.4 - Prob. 1EQCh. 39.4 - Prob. 2EQ
Ch. 39.4 - Prob. 6CCCh. 39.4 - Core Skill: Connections Look back to Figure 36.16,...Ch. 39 - Prob. 1TYCh. 39 - Prob. 2TYCh. 39 - Prob. 3TYCh. 39 - Prob. 4TYCh. 39 - Prob. 5TYCh. 39 - Which of the following statements best explains...Ch. 39 - What features of water explain how it can be drawn...Ch. 39 - Prob. 8TYCh. 39 - Prob. 9TYCh. 39 - Prob. 10TYCh. 39 - Prob. 1CQCh. 39 - Prob. 2CQCh. 39 - Prob. 3CQCh. 39 - Prob. 1COQCh. 39 - Prob. 2COQ
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