Becker's World of the Cell (9th Edition)
Becker's World of the Cell (9th Edition)
9th Edition
ISBN: 9780321934925
Author: Jeff Hardin, Gregory Paul Bertoni
Publisher: PEARSON
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Chapter 8, Problem 8.5PS

(a)

Summary Introduction

To determine: ΔG for the transport of potassium ions into a cell having no membrane potential across its plasma membrane.

Introduction: The transport of sodium and potassium ions across the membrane is an active transport process, which involve the hydrolysis of adenosine triphosphate (ATP) to provide the energy. It is done with the help of enzyme Na+/K+-ATPase. Most cells of human body pump potassium ion inside the cell to maintain internal potassium ion concentration which is 30 to 40 times the external concentration.

(b)

Summary Introduction

To determine: ΔG for inward transport of potassium ions having membrane potential of -60mM.

Introduction: The transport of sodium and potassium ions across the membrane is an active transport process, which involve the hydrolysis of adenosine triphosphate (ATP) to provide the energy. It is done with the help of enzyme Na+/K+-ATPase. Most cells of human body pump potassium ion inside the cell to maintain internal potassium ion concentration which is 30 to 40 times the external concentration.

(c)

Summary Introduction

To determine: The maximum number of potassium ions that can be pumped inward by the hydrolysis of one ATP molecule if the ATP/ADP ratio in the cell is 5:1 and the inorganic phosphate concentration is 10mM.

Introduction: The transport of sodium and potassium ions across the membrane is an active transport process, which involve the hydrolysis of adenosine triphosphate (ATP) to provide the energy. It is done with the help of enzyme Na+/K+-ATPase. Most cells of human body pump potassium ion inside the cell to maintain internal potassium ion concentration which is 30 to 40 times the external concentration.

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