Examine the experimental chamber in Figure 6.8a. Explain what would occur by osmosis if you added a 1-M solution of sodium chloride on the left side and an equal volume of a 1.5 M solution of potassium ions on the right. How might the addition of the CFTR protein to the lipid bilayer impact the direction of water movement?

Video transcript

Welcome back. Everyone. Here's our next question. Why do slugs and snails die when sprinkled with salt? Well, we recall that slugs and snails have moist skin. So when you Sprinkle salt on the outside, um you have this concentrated brian that forms on the outside. As a result, water leaves the cells of the slugs and snails trying to equalize the salt concentration by osmosis. Um This ends up resulting in dehydration and death by dehydration for the slug and snail. So when we look at our answer choices, we see that choice D. Is the water leaves their cells. So that's the best description of what causes their death. Well, just look at our other answer choices to see why they are not the correct ones. Choice A. Says they have low salt tolerance. Um Well that's a sort of true but not the best definition. Um The low salt tolerance would be if you were feeding it to them or something where you're just sprinkling it on the outside. So that's not our correct answer. Choice B. Says salt is toxic for them. Again in the right amount, it's not toxic but putting on the outside causes that issue with osmosis and dehydration. So Choice B is not correct. Choice C. Says salt can enter their cytoplasm. Um No the salt is not entering salt is um forms ionic uh forms ions that cannot diffuse through the cell membrane of the cytoplasm. But the issue is the water diffusing out through the cell membrane out of the cells when the salt is on the outside. So Choice C. Not correct. But choice D. The water leaves our cells is the correct answer. Thanks for watching. See you in the next video.