Nuclear receptors bind as dimers to inverted repeat DNA sequences. These receptors can be categorized into two groups: steriod receptors and metabolite receptors. Match the description with the type of nuclear receptor. a. Form head-to-tai dimers
b. These receptors typically bind cholesterol- derived hormones
c. Bind to direct repeat DNA sequences
d. Ligands are often derived from dietary nutrients, including vitamins, lipids, and derivatives of amino acids
e. Bind to inverted base repeats due to the orientation of the receptor dimer

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.