Question

what does glycolysis produce that is used in later stages of respiration?
o a molecules needed for steps 2 and 3
o b chlorophyll
o c oxygen gas
o d carbon dioxide
question 12 (1 point)
which step of cellular respiration produces carbon dioxide as waste?
o a glycolysis
o b alcoholic fermentation
o c electron transport chain
o d krebs cycle
question 13 (1 point)
which step uses oxygen and produces the largest amount of atp?
o a glycolysis
o b electron transport chain
o c fermentation
o d krebs cycle

Explanation:

• Question 11: Glycolysis produces pyruvate (molecules used in steps 2 - Krebs cycle and 3 - electron transport chain in aerobic respiration). Chlorophyll is for photosynthesis, oxygen is from photosynthesis (not glycolysis), and carbon dioxide is mainly from Krebs cycle.
• Question 12: In the Krebs cycle (citric acid cycle), carbon - containing molecules are oxidized and carbon dioxide is released as a waste product. Glycolysis produces pyruvate, alcoholic fermentation produces ethanol and carbon dioxide (but it's a type of anaerobic respiration, not the main step in aerobic cellular respiration for carbon - dioxide - as - waste in the context of standard cellular respiration steps), and the electron transport chain mainly produces water.
• Question 13: The electron transport chain uses oxygen (final electron acceptor) and through chemiosmosis, produces the largest amount of ATP (about 28 - 32 ATP per glucose molecule). Glycolysis produces 2 ATP, fermentation (anaerobic) produces little ATP (2 ATP in alcohol or lactic acid fermentation), and the Krebs cycle produces 2 ATP per glucose molecule (but also many electron carriers for the electron transport chain).

Answer:

• Question 11: a. Molecules needed for steps 2 and 3
• Question 12: d. Kreb's Cycle
• Question 13: b. Electron Transport Chain