Why are metaphase chromosomes always used in the preparation of karyotypes A)

This is the stage when the chromosomes are easier to see because they are fully condensed.

B)

This is the stage when the chromosomes are easier to see because they are elongated and uncondensed.

C)

The X and Y chromosomes are only present during metaphase.

D)

This is the only cell cycle phase when the chromosomes are unduplicated.

E)

This is when the chromosomes are being duplicated.

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.