I think it is mitochondria. Yes, most likely it is.
Explanation:
purines-Double carbon-nitrogen ring with four nitrogen atoms
pyrimidines-Single carbon-nitrogen ring with two nitrogen atoms
Transport proteins require energy because they are pumping materials. Without energy, they won't function and we will have huge problems in our body.
I hope this helps! :D
Answer:
definition: one of the three primary embryonic cell layers.
