Campbell Biology (Looseleaf) - With Access (Custom)
Campbell Biology (Looseleaf) - With Access (Custom)
10th Edition
ISBN: 9781269878425
Author: Reece
Publisher: PEARSON
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Chapter 7, Problem 5TYU
Summary Introduction

To examine: The experimental treatment that will increase the rate of sucrose transport into a plant cell.

Introduction: A transporter is a protein that spans the lipid bilayer of a plasma membrane and helps the molecules, ions, and other solutes to pass through it. Active transport maintains the internal concentration of solutes that differ in concentration from the environment. Active transport requires energy expenditure to perform the work. The energy is supplied by the hydrolysis of adenosine triphosphate (ATP). A cotransporter is a protein that couples a substance against their concentration gradient in a company of a substance that diffuses down to their concentration gradient. In a cotransporter, the ATP molecule is utilized indirectly to provide the energy necessary for cotransport. ATP is utilized by a proton pump to translocate the hydrogen ions (H+). This proton gradient is utilized for the transport of sucrose molecule by a cotransporter.

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1. Channel proteins used for the bulk passage of water molecules across the cell membrane?2. The tonicity of the extracellular fluid that maintains the turgid appearance of plant cells?3. The tonicity of the extracellular environment causing plasmolysis of plant cells?4. Plant cells are said to be flaccid in this type of cellular environment or solution?
Which of the following statements concerning axonal transport is FALSE O A) The polarity of microtubules helps determine the direction of transport B) Trophic substances and growth factors are taken up by the nerve terminal and transported in the retrograde direction. C) Retrograde transport uses actin filaments and anterograde transport uses microtubules. O D) Motor proteins sometimes compete for different cargoes O E) Kinesins and dyneins transport cargoes in opposite directions along microtubules
.a) In Activity 3, you drew plant cells and you may have noticed that the cells appear rectangular or square in shape. Which structure of the plant cell gives the cell its rigid, defined shape?   b.Is this structure found in animal (cheek) cells?

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