- A) First step in cellular respiration
- B) Water is the last electron acceptor
- C) NADH and FADH₂ donate electrons
- D) Electrons gain energy as they move down the chain
Biochemistry MCQ
Total MCQ: 92
42 What kind of bond is formed when lithium and fluorine combine to form lithium fluoride?
- A) Nonpolar covalent
- B) Redox
- C) Polar covalent
- D) Ionic
43 Which stage of glucose metabolism produces the most ATP?
- A) Krebs cycle
- B) Glycolysis
- C) Fermentation of pyruvate to lactate
- D) Electron transport and chemiosmosis
44 Gaseous hydrogen burns in the presence of oxygen to form water: 2H₂ + O₂ → 2H₂O + energy
- A) Hydrogen, polar
- B) Oxygen, polar
- C) Oxygen, nonpolar
- D) Hydrogen, nonpolar
45 True or false? The reactions that generate the largest amounts of ATP during cellular respiration take place in the mitochondria.
- A) TRUE
- B) FALSE
- C)
- D)
46 Which of the following best describes the main purpose of the combined processes of glycolysis and cellular respiration?
- A) Molecules in chemical bonds that cells can use for work
- B) Producing complex molecules from chemical building blocks
- C) The breakdown of glucose to carbon dioxide and water
- D) Breaking down ATP, so that ADP and P can be reused
47 What is the oxidizing agent in the reaction: Pyruvate + NADH + H⁺ → Lactate + NAD⁺
- A) Oxygen
- B) Pyruvate
- C) NADH
- D) Lactate
48 Which of the following describes the process of glycolysis?
- A) Converts glucose to pyruvate and CO₂
- B) First stage of glucose oxidation
- C) Occurs in mitochondria
- D) Produces 30 ATP, NADH
49 When electrons flow along the electron transport chains of mitochondria, which of the following changes occurs?
- A) NAD⁺ is oxidized
- B) ATP synthase pumps protons
- C) Cytochromes phosphorylate ADP
- D) pH of the matrix increases
50 How many NADH are produced by glycolysis?
- A) 3
- B) 2
- C) 4
- D) 5