BS 161 EXAM 2 013, 014, and 015
UPDATED ACTUAL Questions and
CORRECT Answers
What is the main goal of cellular respiration? - CORRECT ANSWER - To produce ATP
by extracting energy from glucose.
What are the 4 stages of cellular respiration (in order)? - CORRECT ANSWER - 1.
Glycolysis 2. Pyruvate oxidation 3. Citric acid cycle (Krebs cycle) 4. Electron transport chain
and oxidative phosphorylation
Where does glycolysis occur? - CORRECT ANSWER - In the cytoplasm of the cell.
Does glycolysis require oxygen? - CORRECT ANSWER - No — it is anaerobic.
What are the products of glycolysis? - CORRECT ANSWER - 2 pyruvate, 2 ATP (net
gain), and 2 NADH.
What happens during glycolysis? - CORRECT ANSWER - Glucose (6C) is split into two
3-carbon molecules of pyruvate.
What happens to pyruvate after glycolysis (if oxygen is present)? - CORRECT
ANSWER - It is transported into the mitochondrion and converted to acetyl-CoA.
What are the products of pyruvate oxidation? - CORRECT ANSWER - 2 acetyl-CoA, 2
CO₂, and 2 NADH (one per pyruvate).
Where does the citric acid (Krebs) cycle occur? - CORRECT ANSWER - In the
mitochondrial matrix.
, What enters the citric acid cycle? - CORRECT ANSWER - Acetyl-CoA.
What are the products of one turn of the citric acid cycle? - CORRECT ANSWER -3
NADH, 1 FADH₂, 1 ATP, and 2 CO₂.
What is the purpose of NADH and FADH₂ in respiration? - CORRECT ANSWER - They
carry high-energy electrons to the electron transport chain (ETC).
Where is the electron transport chain (ETC) located? - CORRECT ANSWER - In the inner
mitochondrial membrane.
What happens in the electron transport chain? - CORRECT ANSWER - Electrons from
NADH and FADH₂ are passed along protein complexes, releasing energy used to pump H⁺ ions
into the intermembrane space.
What is the purpose of the proton (H⁺) gradient? - CORRECT ANSWER - It drives ATP
synthesis as protons flow back through ATP synthase.
What enzyme makes ATP in oxidative phosphorylation? - CORRECT ANSWER - ATP
synthase.
What is the final electron acceptor in the ETC? - CORRECT ANSWER - Oxygen (O₂),
which combines with electrons and H⁺ to form water.
What is oxidative phosphorylation? - CORRECT ANSWER - The process of using the
ETC and ATP synthase to generate ATP using oxygen.
How many ATP are produced in cellular respiration per glucose molecule (approx.)? -
CORRECT ANSWER - About 30-32 ATP total.
UPDATED ACTUAL Questions and
CORRECT Answers
What is the main goal of cellular respiration? - CORRECT ANSWER - To produce ATP
by extracting energy from glucose.
What are the 4 stages of cellular respiration (in order)? - CORRECT ANSWER - 1.
Glycolysis 2. Pyruvate oxidation 3. Citric acid cycle (Krebs cycle) 4. Electron transport chain
and oxidative phosphorylation
Where does glycolysis occur? - CORRECT ANSWER - In the cytoplasm of the cell.
Does glycolysis require oxygen? - CORRECT ANSWER - No — it is anaerobic.
What are the products of glycolysis? - CORRECT ANSWER - 2 pyruvate, 2 ATP (net
gain), and 2 NADH.
What happens during glycolysis? - CORRECT ANSWER - Glucose (6C) is split into two
3-carbon molecules of pyruvate.
What happens to pyruvate after glycolysis (if oxygen is present)? - CORRECT
ANSWER - It is transported into the mitochondrion and converted to acetyl-CoA.
What are the products of pyruvate oxidation? - CORRECT ANSWER - 2 acetyl-CoA, 2
CO₂, and 2 NADH (one per pyruvate).
Where does the citric acid (Krebs) cycle occur? - CORRECT ANSWER - In the
mitochondrial matrix.
, What enters the citric acid cycle? - CORRECT ANSWER - Acetyl-CoA.
What are the products of one turn of the citric acid cycle? - CORRECT ANSWER -3
NADH, 1 FADH₂, 1 ATP, and 2 CO₂.
What is the purpose of NADH and FADH₂ in respiration? - CORRECT ANSWER - They
carry high-energy electrons to the electron transport chain (ETC).
Where is the electron transport chain (ETC) located? - CORRECT ANSWER - In the inner
mitochondrial membrane.
What happens in the electron transport chain? - CORRECT ANSWER - Electrons from
NADH and FADH₂ are passed along protein complexes, releasing energy used to pump H⁺ ions
into the intermembrane space.
What is the purpose of the proton (H⁺) gradient? - CORRECT ANSWER - It drives ATP
synthesis as protons flow back through ATP synthase.
What enzyme makes ATP in oxidative phosphorylation? - CORRECT ANSWER - ATP
synthase.
What is the final electron acceptor in the ETC? - CORRECT ANSWER - Oxygen (O₂),
which combines with electrons and H⁺ to form water.
What is oxidative phosphorylation? - CORRECT ANSWER - The process of using the
ETC and ATP synthase to generate ATP using oxygen.
How many ATP are produced in cellular respiration per glucose molecule (approx.)? -
CORRECT ANSWER - About 30-32 ATP total.
