THE CELL
STRUCTURE AND FUNCTION OF THE CELL
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following molecules pass easily through the cell membrane, requiring little extra help or energy? Select all that apply.
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sodium
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glucose
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oxygen
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carbon dioxide
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Explanation:
Detailed explanation-1: -Oxygen and carbon dioxide can easily pass through the plasma membrane by simple diffusion due to their small molecular size.
Detailed explanation-2: -Small nonpolar molecules, such as O2 and CO2, are soluble in the lipid bilayer and therefore can readily cross cell membranes. Small uncharged polar molecules, such as H2O, also can diffuse through membranes, but larger uncharged polar molecules, such as glucose, cannot.
Detailed explanation-3: -4.1 Passive Diffusion For example, small nonpolar gases such as O2, CO2, and N2, and small polar molecules such as ethanol cross lipid membranes rapidly.
There is 1 question to complete.