Consider the artificial cell experiment below: Lactose 2.0 M Ca+ = 0.4 M Lactose = 0.1 M Ca+ = 3.0 M The ion channels in the membrane will allow Ca+ to pass freely, but nothing else. The starting conditions for the experiment are shown. Rewrite the following statement to make it correct: "The calcium ions will move across the membrane because ion channels allow active transport." Edit View Insert Format Tools Table

Consider the artificial cell experiment below: Lactose 2.0 M Ca+ = 0.4 M Lactose = 0.1 M Ca+ = 3.0 M The ion channels in the membrane will allow Ca+ to pass freely, but nothing else. The starting conditions for the experiment are shown. Rewrite the following statement to make it correct: "The calcium ions will move across the membrane because ion channels allow active transport." Edit View Insert Format Tools Table

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter3: The Plasma Membrane And Membrane Potential

Section: Chapter Questions

Problem 7RE

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The primary function of the kidney is to exchange molecules across a membrane between the blood and the urine. One type of kidney cell has a basic rectangular shape, except for a single surface, which is lined with tiny, finger-like projections that extend into the surrounding extracellular space. Which of the following best explains the advantage these projections provide the cell? The projections increase the selectivity of the membrane because the small size of the projections limits the number of transport proteins that can be embedded in the membrane. The projections increase the volume of the cell without affecting the surface area, which increases the metabolic needs of the cell. The projections increase the surface area–to-volume ratio of the cell, which allows for more efficient nutrient exchange with the environment. The projections increase the speed at which an individual molecule can move,…
The following are the characteristics of the setup depicted below: The left side has a higher concentration of "yellow spheres" than the right side. The blue solution is water, and the yellow spheres dissolve in water (i.e. are osmoles). The dotted orange line is a semi-permeable membrane with characteristics exactly the same as a cell's plasma membrane. Below are TWO "If" statements that are separate questions. IF the yellow spheres are freely permeable across the dotted line, the process of [ Select ] ["facilitated diffusion", "active transport", "simple diffusion", "osmosis"] will occur. Consequently, the volume of water on the left side will [ Select ] ["stay the same", "decrease", "increase"] IF the yellow spheres cannot cross the membrane at all, the process of [ Select ] ["osmosis", "facilitated…
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When fluorescein-dyed human proteins were first mixed with rhodamine-dyed mouse proteins (in mouse/human hybrid cell fusions carried out in the 1970s), these proteins appeared to exhibit: restricted movement, based on confinement by diffusion barriers restricted movement, based on tethering to extracellular molecules unrestricted movement, similar to membrane phospholipids restricted movement, based on anchoring to intracellular proteins restricted movement, based on attachment to other cells
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