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Ch. 36 - Resource Acquisition and Transport in Vascular Plants
Campbell - Campbell Biology 11th Edition
Urry11th EditionCampbell BiologyISBN: 9789357423311Not the one you use?Change textbook
All textbooksUrry 11th EditionCh. 36 - Resource Acquisition and Transport in Vascular PlantsProblem 7
Chapter 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 guidance
1
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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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

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.

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

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