Textbook Question
What would enhance water uptake by a plant cell?
a. Decreasing the Ψ of the surrounding solution
b. Positive pressure on the surrounding solution
c. The loss of solutes from the cell
d. Increasing the Ψ of the cytoplasm
Ch. 36 - Resource Acquisition and Transport in Vascular Plants
Urry12th EditionCampbell BiologyISBN: 9785794169850
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Table of contents
- Ch. 1 - Evolution, the Themes of Biology, and Scientific Inquiry8
- Ch. 2 - The Chemical Context of Life8
- Ch. 3 - Water and Life6
- Ch. 4 - Carbon and the Molecular Diversity of Life9
- Ch. 5 - The Structure and Function of Large Biological Molecules9
- Ch. 6 - A Tour of the Cell6
- Ch. 7 - Membrane Structure and Function6
- Ch. 8 - An Introduction to Metabolism6
- Ch. 9 - Cellular Respiration and Fermentation10
- Ch. 10 - Photosynthesis7
- Ch. 11 - Cell Communication7
- Ch. 12 - The Cell Cycle11
- Ch. 13 - Meiosis and Sexual Life Cycles10
- Ch. 14 - Mendel and the Gene Idea14
- Ch, 15 - The Chromosomal Basis of Inheritance6
- Ch. 16 - The Molecular Basis of Inheritance9
- Ch. 17 - Gene Expression: From Gene to Protein9
- Ch. 18 - Regulation of Gene Expression10
- Ch. 19 - Viruses6
- Ch. 20 - DNA Tools and Biotechnology7
- Ch. 21 - Genomes and Their Evolution8
- Ch. 22 - Descent with Modification: A Darwininan View of Life6
- Ch. 23 - The Evolution of Populations5
- Ch. 24 - The Origin of Species6
- Ch. 25 - The History of Life on Earth8
- Ch. 26 - Phylogeny and the Tree of Life8
- Ch. 27 - Bacteria and Archaea6
- Ch. 28 - Protists7
- Ch. 29 - Plant Diversity I: How Plants Colonized Land7
- Ch. 30 - Plant Diversity II: The Evolution of Seed Plants6
- Ch. 31 - Fungi5
- Ch. 32 - An Overview of Animal Diversity4
- Ch. 33 - An introduction to Invertebrates6
- Ch. 34 - The Origin and Evolution of Vertebrates7
- Ch. 35 - Vascular Plant Structure, Growth, and Development10
- Ch. 36 - Resource Acquisition and Transport in Vascular Plants8
- Ch. 37 - Soil and Plant Nutrition11
- Ch. 38 - Angiosperm Reproduction and Biotechnology8
- Ch. 39 - Plant Responses to Internal and External Signals8
- Ch. 40 - Basic Principles of Animal Form and Function8
- Ch. 41 - Animal Nutrition7
- Ch. 42 - Circulation and Gas Exchange7
- Ch. 43 - The Immune System5
- Ch. 44 - Osmoregulation and Excretion6
- Ch. 45 - Hormones and the Endocrine System8
- Ch. 46 - Animal Reproduction9
- Ch. 47 - Animal Development8
- Ch. 48 - Neurons, Synapses, and Signaling6
- Ch. 49 - Nervous Systems8
- Ch. 50 - Sensory and Motor Mechanisms5
- Ch. 51 Animal Behavior6
- Ch. 52 - An Introduction to Ecology and the Biosphere7
- Ch. 53 - Population Ecology9
- Ch. 54 - Community Ecology9
- Ch. 55 - Ecosystems and Restoration Ecology8
- Ch. 56 - Conservation Biology and Global Change6
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Urry 12th EditionCh. 36 - Resource Acquisition and Transport in Vascular PlantsProblem 7
Urry 12th EditionCh. 36 - Resource Acquisition and Transport in Vascular PlantsProblem 7Chapter 36, Problem 7
Compared with a cell with few aquaporin proteins in its membrane, a cell containing many aquaporin proteins will
a. Have a faster rate of osmosis
b. Have a lower water potential
c. Have a higher water potential
d. Accumulate water by active transport
Verified step by step guidance1
Understand the role of aquaporin proteins: Aquaporins are integral membrane proteins that serve as channels for water molecules to pass through the cell membrane. They facilitate the rapid transport of water across the membrane.
Consider the process of osmosis: Osmosis is the passive movement of water molecules from an area of higher water potential to an area of lower water potential through a selectively permeable membrane.
Analyze the effect of aquaporin quantity on osmosis: A cell with many aquaporin proteins will allow more water molecules to pass through the membrane quickly, compared to a cell with fewer aquaporins.
Evaluate the options: Since aquaporins increase the rate at which water can move across the membrane, the presence of many aquaporins would likely result in a faster rate of osmosis.
Conclude the reasoning: Based on the understanding of aquaporins and osmosis, determine which option correctly describes the effect of having many aquaporin proteins in the cell membrane.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Aquaporins
Aquaporins are integral membrane proteins that form channels in the cell membrane, facilitating the transport of water molecules. They increase the permeability of the membrane to water, allowing for rapid osmosis. The presence of more aquaporins enhances the rate at which water can move across the cell membrane, crucial for maintaining cellular water balance.
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Transport Proteins of Facilitated Diffusion
Osmosis
Osmosis is the passive movement of water molecules across a semipermeable membrane from a region of higher water potential to a region of lower water potential. It is driven by differences in solute concentration and does not require energy. The rate of osmosis can be influenced by the number of aquaporins present, as they provide pathways for water to move more efficiently.
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Water Potential
Water potential is a measure of the potential energy of water in a system, influenced by solute concentration and pressure. It determines the direction of water movement during osmosis. A cell with many aquaporins does not inherently change its water potential but allows water to move more freely, affecting the rate of osmosis rather than the water potential itself.
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Related Practice
Textbook Question
A plant cell with a ΨS of −0.65MPa maintains a constant volume when bathed in a solution that has a ΨS of −0.30MPa and is in an open container. The cell has a
a. ΨP of +0.65MPa
b. Ψ of −0.65MPa
c. ΨP of +0.35MPa
d. ΨP of 0 MPa
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Textbook Question
Which of the following would tend to increase transpiration?
a. Spiny leaves
b. Sunken stomata
c. A thicker cuticle
d. Higher stomatal density
Textbook Question
Photosynthesis ceases when leaves wilt, mainly because
a. The chlorophyll in wilting leaves is degraded.
b. Accumulation of CO2 in the leaf inhibits enzymes.
c. Stomata close, preventing CO2 from entering the leaf.
d. Photolysis, the water-splitting step of photosynthesis, cannot occur when there is a water deficiency.