Question

what do aerobic respiration and anaerobic respiration have in common?
both begin with glycolysis.
both occur in mitochondria.
both require oxygen to proceed.
both end with the electron transport chain.

Explanation:

Aerobic respiration starts with glycolysis in the cytoplasm and then continues in mitochondria with the Krebs - cycle and electron - transport chain, requiring oxygen. Anaerobic respiration starts with glycolysis too but then proceeds without oxygen, either through fermentation in the cytoplasm. Glycolysis is the common first step. Anaerobic respiration doesn't occur in mitochondria, doesn't require oxygen, and doesn't end with the electron - transport chain.

Answer:

Both begin with glycolysis.