What is the function of nitrogen-fixing
bacteria?
a. they are able to repair damaged nitrogen compounds.
b. they are able to release nitrogen into the atmosphere.
c. they are able to take atmospheric nitrogen and convert it to
usable ammonium.

In which of the following ways is the function of the surface of a microsphere similar to the function of an actual cell membrane? a. both make it possible for the conditions in the interior to be different from the conditions outside. b. both provide a barrier that keeps water from flowing across it so the interior remains dry. c. both separate the rna that forms in the interior from any rna that might form in the environment. d. both can actively move molecules into the interior or out into the surrounding environment.

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

Most animal cells membranes have proteins that pump ions out of the cell and potassium ions into the cell