Campbell Biology in Focus (2nd Edition)
Campbell Biology in Focus (2nd Edition)
2nd Edition
ISBN: 9780321962751
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece
Publisher: PEARSON
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Chapter 5.2, Problem 2CC

Why is a transport protein needed to move many water molecules rapidly across a membrane?

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In terms of rate of transport of a molecule across a membrane , what is the difference between passive and active transport?
Describe the movement of the solute and explain why this is considered passive transport.
The transport of a molecule is investigated using two chambers (left and right) separated by a synthetic membrane containing transport proteins. A solution containing varying concentrations of the molecule is added to the left side while pure water is added to the right. The transport rate of the molecule is determined by measuring the concentration of molecule that accumulates on the right side. The following table summarizes the transport rate of the molecule at various concentrations. Based on this you can conclude:  a) the molecule is most likely transported by facilitated diffusion     b) the molecule is moving across the membrane by passive transport     c) the membrane is freely permeable to the molecule     d) the molecule is most likely transported by active transport

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Campbell Biology in Focus (2nd Edition)

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