The pumping of hydrogen ions (protons) across membranes during chemiosmosis is an example of which type of cellular transport?

active

facilitated diffusion

osmosis

endocytosis

I believe the correct answer from the choices listed above is the second option. Chemiosmosis is the process of using a hydrogen concentration and electrochemical gradient to move hydrogen ions through a specialized protein channel, thus driving a chemical process. Therefore, it is a facilitated diffusion which uses regular diffusion as the driving force (i.e. the molecule moves from high to low concentration), but unlike regular diffusion does so only through specialized channels.

The combined mass of both

There are four nitrogenous bases that make up dna. the two pyramidines are thymine and cytosine. the two purines are adenine and guanine. these bases pair in a very specific way. adenine - thymineguanine - cytosine i remember it like this: a tall, good cat.