Which of the following requires energy input to happen? *There are multiple correct answers here* Breaking down starch
photosynthesis where carbon dioxide molecules are joined together with parts of water molecules to make sugar
Forming a molecule of DNA from nucleotides
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forming a protein from amino acids
cellular respiration where l'arge biomolecules are broken down into their parts
Linking two sugar molecules together
Breaking down fat molecules

~potters6/te801/biology/biounits/respiration.htm

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.