What structure in a bacterial cell controls which substances enter and leave the cell? the cell membrane the cytoplasm the ribosome the flagella

The cell membrane

Explanation:

The cell membrane is the outermost covering of a cell that is semipermeable and thus allows only selective transport of substances across the cell.The cell membrane is responsible for separating the internal contents of a cell from the external environment. The cell membrane is a phospholipid bilayer which has proteins present in it that either embedded deep within it or associated loosely. The cell membrane makes sure that the cell can maintain a constant ionic composition and protects it from the surrounding environment.

Atp is is our little "pocket" of energy. of course, if you have too little, then it means you have too little energy, and you'll pass out. the way to not have enough, is to have no energy sources (glucose, fats, proteins). you can't have too many atp molecules. cycles like the krebs cycle produce it, but if you have too much of any substrate (or too little for that matter), the cycle stops and atp is no longer made (it stops until substrate levels are such that the process can go on). in any case, this is unlikely since atp is constantly hydrolyzed and remade, even while you're asleep. you won't have too much. if you have zero, you are dead or dying.