When muscle cells lack oxygen but need to generate more ATP, what do they convert pyruvate into? X: product
Y: reactant

X: active site
Y: reactant

X: substrate
Y: product

X: substrate
Y: active site

b exhibiting favoritism toward the kikuyu people.

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.

a symbiotic relationship with the mitochondria