Gases like oxygen and carbon dioxide move across cell membranes using what?

When does dna replication(make a copy of itself)?

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

Ascientist wanted to formulate a pill to attack a specific type of bacteria that infects the throat. which biological component would be best to use as a model for the pill's function? bacteriocytes phagocytes complement antibodies