Answer: B
A-Glucose
B-Oxygen
C- Enzyme
D- CO2
Complete Equation
Glucose + Oxygen → ATP + C02 + H20.
enzyme
Explanation:
This represented the chemical pathway of Cellular respiration. it is the process of breaking down glucose in the cytoplasm to pyruvate in presence of enzymes(hexokinase, phosphorfructokinase) the process is called Glycolysis,
The use of the pyruvate as acetyl Co A combined with oxaloacetate to generate ATP, and produce C02 and H20 vapour as by-products in a pathway called Kreb-Cycle. H+ are removed by Coenzymes NADH+ and FADH+
The NADH+ and FADH+ are transferred to the mitochondria matrix , where Hydrogen is split to H+ and e-for ECT, The e- forms the electron transport chain, and while the H+ is pumped by PMF across the mitochondria intramembrane to generate energy from electrochemical gradients which is needed for ATPs synthesis, by ATPase synthase. Oxygen is the final oxygen acceptor.
Thus option B is the answer.