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An ion channel in a cell membrane is modeled as a cylindrical opening in the membrane. Because the ion concentration outside the cell is larger than that inside the cell, there is a net flux of ions from outside to inside. If the diameter of the cylindrical opening is doubled, the number of ions per time passing into the cell is: unchanged halved quadrupled doubled quartered

An ion channel in a cell membrane is modeled as a cylindrical opening in the membrane. Because the ion concentration outside the cell is larger than that inside the cell, there is a net flux of ions from outside to inside. If the diameter of the cylindrical opening is doubled, the number of ions per time passing into the cell is: unchanged halved quadrupled doubled quartered

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Question 2 An ion channel in a cell membrane is modeled as a cylindrical opening in the membrane. Because the ion concentration outside the cell is larger than that inside the cell, there is a net flux of ions from outside to inside. If the diameter of the cylindrical opening is doubled, the number of ions per time passing into the cell is: O unchanged O halved quadrupled doubled O quartered Question 4 Initially at rest, a gazelle accelerates at a constant rate, moving in a straight line. After 10 seconds it achieves a speed of 25 m/s. How far did the gazelle travel? 250 m O 125 m 62.5 m O 500 m not enough information to determine
Transcribed Image Text:Question 2 An ion channel in a cell membrane is modeled as a cylindrical opening in the membrane. Because the ion concentration outside the cell is larger than that inside the cell, there is a net flux of ions from outside to inside. If the diameter of the cylindrical opening is doubled, the number of ions per time passing into the cell is: O unchanged O halved quadrupled doubled O quartered Question 4 Initially at rest, a gazelle accelerates at a constant rate, moving in a straight line. After 10 seconds it achieves a speed of 25 m/s. How far did the gazelle travel? 250 m O 125 m 62.5 m O 500 m not enough information to determine
Question 5 You are observing a microbead (with mass 10 µg) undergoing random motion in a glycerin solution. The microbead has an initial velocity of 10 um/s (micrometers per second) along the x-axis. Suddenly its velocity changes to -5 µm/s, still along the x-axis. What was the impulse experienced by the microbead in units of µg-um/s? O -100 O +150 +100 -150 -50
Transcribed Image Text:Question 5 You are observing a microbead (with mass 10 µg) undergoing random motion in a glycerin solution. The microbead has an initial velocity of 10 um/s (micrometers per second) along the x-axis. Suddenly its velocity changes to -5 µm/s, still along the x-axis. What was the impulse experienced by the microbead in units of µg-um/s? O -100 O +150 +100 -150 -50
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