I believe the answer is D. A reactant that is catalyze a by an enzyme.
Bacteroid has a thick cell wall which is absent in a bacterial cell(its outer structure is made up of a cytoplasmic membrane).
Answer: D). Proximal end
Explanation:
The less moveable end of the skeletal muscle is the medial or proximal end. It can be found near the point of attachement of the bones called as origin. It can be observed near the midline of the body.
It is A: a chemical reaction, due to the acid activity (acetic acid)
