Which of the following are examples of diffusion (either passive or facilitated)? Glucose in the bloodstream moves through a GLUT channel in to a cell where its concentration is low ATP is expended by the Na/K ATPase to pump three sodium ions out of the cell and two potassium ions in SGLTS use a pre-established sodium concentration gradient to pump glucose in to the cell Small particles can move freely through the outer mitochondrial membrane down their concentration gradient Steroid hormones pass through the cell membrane and bind to receptors in the nucleus Hydrogen ions are pumped out of the mitochondrial matrix--where pH is high--in to the intermembrane space--where pH is low

Which of the following are examples of diffusion (either passive or facilitated)? Glucose in the bloodstream moves through a GLUT channel in to a cell where its concentration is low ATP is expended by the Na/K ATPase to pump three sodium ions out of the cell and two potassium ions in SGLTS use a pre-established sodium concentration gradient to pump glucose in to the cell Small particles can move freely through the outer mitochondrial membrane down their concentration gradient Steroid hormones pass through the cell membrane and bind to receptors in the nucleus Hydrogen ions are pumped out of the mitochondrial matrix--where pH is high--in to the intermembrane space--where pH is low

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter5: Structure And Function Of Plasma Membranes

Section: Chapter Questions

Problem 11RQ: In which situation would passive transport not use a transport protein for entry into a cell? water...

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In which situation would passive transport not use a transport protein for entry into a cell? water flowing into a hypertonic environment glucose being absorbed from the blood an ion flowing into a nerve cell to create an electrical potential oxygen moving into a cell after oxygen deprivation
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Quantitative – diffusion time: Consider a spherical, single-celled organism which needs oxygen tosurvive. a. Assume oxygen needs to diffuse from the outside of the cell to its center. Write an equation thatgives the diffusion time in terms of the cell radius. b. The cell has a 4 micron (m) diameter, and diffusion coefficient of oxygen is 1.8 x 10-5 cm2/s inwater (assume diffusion is the same through the cell membrane). How long does it take for oxygento diffuse to the center of the cell? c. Cells typically need key molecules such as oxygen to survive. Diffusion times of oxygen can limithow big cells can become. If the cell gets too large for oxygen to reach its center, the cell coulddie. Calculate the size of a cell at which oxygen diffusion time becomes too slow and so limits theability of the cell to get that big. Explain your assumptions. How does this compare to typical cellsizes?
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