Two types of transport of molecules across a cell membrane are: transport 1: solute molecules move across the cell membrane along their concentration gradient; requires no energy expenditure. transport 2: solute molecules move across the cell membrane against their concentration gradient; requires expenditure of energy.

In the question given above, transport 1 describes PASSIVE TRANSPORT while transport 2 describes ACTIVE TRANSPORT.
Passive transport are the simplest type of transport that take place at the cell membranes. It involves the movement of ions across a membrane without the need for energy. The types of passive transport that exist are diffusion, osmosis, facilitated diffusion and filtration.
Active transport involves the movement of substances across the cell membranes using energy. There are two basic types of active transport, these are primary and secondary active transport.

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.