Semipermeable means the cell membrane can pick and choose what goes out of it and into it. At least, that's what I believe it is.
The branch of science that aims to design workplaces to minimize stress related injuries would be ergonomics.
Can you be more specific to the question
<span>If the hydrogen pump protein in photosystem II does not move enough H+ ions into the thylakoid there will be a decreased in the production of ATP and a decrease in the production of NADPH.</span>
