Question

question 9 of 10
which process in respiration happens first?
a. electron transport chain
b. krebs cycle
c. pyruvate processing
d. glycolysis

Explanation:

Cellular respiration begins with glycolysis. It occurs in the cytoplasm and breaks down glucose into pyruvate. The other processes (pyruvate processing, Krebs cycle, electron transport chain) occur after glycolysis. Pyruvate processing happens next (converting pyruvate to acetyl - CoA), then the Krebs cycle (in the mitochondrial matrix), and finally the electron transport chain (in the inner mitochondrial membrane). So glycolysis is the first step in respiration.

Answer:

D. Glycolysis