The electron transport of respiration occurs in cell structures called mitochondria.
Explanation:
The small number behind each element symbol designates the number of atoms of each element in a chemical formula. If there is no number, it is assumed there is only one of those elements. A large number designates how many units there are of that compound.
Bacterial cells are usually single celled while eukaryotic cells are multi-celled.
The answer is a
