Biology
Biology, 30.07.2019 06:30, msjsnell29

Oxygen moving through the plasma membrane down its concentration gradient is an example of

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Biology, 24.06.2019 14:30, Jasten
Carbon dioxide and oxygen are molecules that can move freely across a plasma membrane. what determines the direction that carbon dioxide and oxygen molecules move? 1points a orientation of cholesterol in the plasma membrane b concentration gradient across the plasma membrane c configuration of phospholipids in the plasma membrane d location of receptors on the surface of the plasma membrane
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Biology, 24.06.2019 19:10, lyrhiii
Which of the following statements correctly describe(s) the driving forces for diffusion of na+ and k+ ions through their respective channels? select all that apply. a. the diffusion of na+ ions into the cell is facilitated by the na+ concentration gradient across the plasma membrane. b. the diffusion of na+ ions into the cell is impeded by the electrical gradient across the plasma membrane. c. the diffusion of k+ ions out of the cell is impeded by the k+ concentration gradient across the plasma membrane. d. the diffusion of k+ ions out of the cell is impeded by the electrical gradient across the plasma membrane. e. the electrochemical gradient is larger for na+ than for k+.
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Biology, 23.07.2019 13:40, zainababbas25
How do materials move across cell membranes? compare the different transport mechanisms for moving molecules across the plasma membrane (e.g. is energy required? are the molecules moving down a concentration gradient or against a concentration gradient?
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Biology, 07.10.2019 16:10, arslonm777
Some molecules, such as water, , and gases, need no assistance crossing the differentially permeable membrane as they are small and uncharged. these molecules are said to flow down their concentration gradient as they move from an area where their concentration is to an area where their concentration is . called transport, these molecules are able to slip between the hydrophilic heads of the phospholipids and pass through the hydrophobic tails of the membrane. water molecules will enter the cell either by diffusing across the plasma membrane, or in some cells, by using special water channels called that allow larger amounts of water to cross the membrane. substances requiring proteins but no energy expenditure to move with a concentration gradient across a membrane do so through . for other substances, such as those moving against concentration gradients, large or polar substances, or some ions, energy is required through a process called transport. this type of transport allows large molecules and some ions to use proteins to assist them across plasma membranes. these proteins are specific for the substances they transport across the plasma membrane and include substances such as sodium ions, , and glucose.
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