A tiny container is filled with water, and a phospholipid membrane is inserted to separate the container into two equal halves. Twenty molecules are then added to one side of the membrane.

If this membrane is permeable to this molecule, after a long time it is likely that

Question

A tiny container is filled with water, and a phospholipid membrane is inserted to separate the container into two equal halves. Twenty molecules are then added to one side of the membrane.

If this membrane is permeable to this molecule, after a long time it is likely that

BlackTom AI · Accepted Answer

Consider the setup: a permeable membrane between two equal water-filled compartments, with 20 identical molecules added to one side. Over a long time, diffusion will move molecules from the side with higher concentration to the side with lower concentration until concentrations are approximately equal.
Option 1: 'the membrane will pump about half of the molecules across to the other side.' This implies active transport requiring energy, which is not described in the scenario. Without energy-dependent pumps, passive diffusion governs the process, so this option misstates the mechanism.
Option 2: 'the 20 molecules will stay on the same side of the membrane to which they were added.' If the membrane is permeable to the molecule and there is a concentration gradient (20 on one side, 0 on the other initially), molecules will diffuse toward the lower-concentration side. Hence this option ignores diffusion and is incorrect.
Option 3: 'there will be about 10 molecules on each sides of the membrane.' Diffusion tends to equalize concentrations across the membrane when the solute is permeable to the membrane, leading to approximately equal numbers on both sides after sufficient time. This aligns with the expectation of a simple diffusion process.
Option 4: 'there will be a net movement of water into the same region as the 20 molecules.' Since the question states the molecule is permeable and focuses on the solute distribution, water movement would depend on osmotic gradients. If the solute freely equilibrates across the membrane, the osmotic gradient would be minimized, and there isn’t a sustained net water flow toward the region containing the solute. Therefore this statement is not supported by the given conditions and is likely incorrect.

A tiny container is filled with water, and a phospholipid membrane is inserted to separate the container into two equal halves. Twenty molecules are then added to one side of the membrane. If this membrane is permeable to this molecule, after a long time it is likely that单项选择题

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