LABORATORY REVIEW
DIFFUSION AND OSMOSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Phospholipids are nonpolar allowing for small, nonpolar substances to dissolve.
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Phospholipids are polar allowing for small, polar substances to dissolve.
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Phospholipids are amphipathic allowing for a nonpolar interior for nonpolar substances to diffuse.
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Phospholipids are amphipathic allowing for polar interior for polar substances to diffuse.
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Detailed explanation-1: -The phospholipids of plasma membranes are amphipathic: they have both hydrophilic (water-loving) and hydrophobic (water-fearing) regions. The hydrophobic core of the plasma membrane helps some materials move through the membrane, while it blocks the movement of others.
Detailed explanation-2: -3 – Simple Diffusion Across the Cell (Plasma) Membrane: The structure of the lipid bilayer allows small, uncharged substances such as oxygen and carbon dioxide, and hydrophobic molecules such as lipids, to pass through the cell membrane, down their concentration gradient, by simple diffusion.
Detailed explanation-3: -Because the cell membrane is semipermeable, only small, uncharged substances like carbon dioxide and oxygen can easily diffuse across it.
Detailed explanation-4: -Answer and Explanation: It is true that oxygen and carbon dioxide can pass directly through a cell’s membrane via passive diffusion.
Detailed explanation-5: -Gases, hydrophobic molecules, and small polar uncharged molecules can diffuse through phospholipid bilayers. Larger polar molecules and charged molecules cannot.