Campbell Biology
Campbell Biology
12th Edition
ISBN: 9780135188743
Author: Urry
Publisher: PEARSON
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Chapter 36.2, Problem 4CC
Summary Introduction

To explain: What happens if plant protoplasts are kept in pure water?

Concept introduction: Protoplasts are isolated plant cells which lack the rigid cell wall that is completely or partially removed using either mechanical or enzymatic methods. The cell wall surrounds plasma membrane and protects the cell from bursting.

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You place a flaccid plant cell (Ψ = -0.7 MPa) into an environment (beaker) of pure (deionized) water (Ψ = 0 MPa). Compare the initial conditions of the flaccid cell and the environment (beaker of pure water) in terms of: D) Water potential (high or low) of the cell E) Solute concentration (high or low) of the cell F) Tonicity (hypertonic, hypotonic, or isotonic) of the cell
You place a flaccid plant cell (Ψ = -0.7 MPa) into an environment (beaker) of pure (deionized) water (Ψ = 0 MPa). Compare the initial conditions of the flaccid cell and the environment (beaker of pure water) in terms of: A) Water potential (high or low) of the environment B) Solute concentration (high or low) of the environment C) Tonicity (hypertonic, hypotonic, or isotonic) of the environment D) Water potential (high or low) of the cell E) Solute concentration (high or low) of the cell F) Tonicity (hypertonic, hypotonic, or isotonic) of the cell G) Predict the direction of water movement (into the cell, out of the cell, or no net movement) H) Predict the change in turgor pressor of the cell (increase turgor pressure or decrease turgor pressure) I) Predict the fate of the cell (plasmolyzed, turgid, or lysed)
You place a flaccid plant cell (Ψ = -0.7 MPa) into an environment (beaker) of sucrose solution (Ψ = -0.9 MPa). Compare the initial conditions of the flaccid cell and the environment (beaker of sucrose solution) in terms of: A) Water potential (high or low) of the environment B) Solute concentration (high or low) of the environment C) Tonicity (hypertonic, hypotonic, or isotonic) of the environment D) Water potential (high or low) of the cell E) Solute concentration (high or low) of the cell F) Tonicity (hypertonic, hypotonic, or isotonic) of the cell G) Predict the direction of water movement (into the cell, out of the cell, or no net movement) H) Predict the change in turgor pressor of the cell (increase turgor pressure or decrease turgor pressure) I) Predict the fate of the cell (plasmolyzed, turgid, or lysed)

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