Quiz for Respiration

Q1: Which of the following is the first step in cellular respiration?

A. Glycolysis B. Krebs cycle C. Electron transport chain D. Fermentation

Q2: In which part of the mitochondria does the electron transport chain occur?

A. Outer membrane B. Matrix C. Intermembrane space D. Inner membrane

Q3: Which enzyme is involved in the conversion of pyruvate to Acetyl-CoA?

A. Hexokinase B. Rubisco C. Pyruvate dehydrogenase D. ATP synthase

Q4: How many ATP molecules are produced by the complete oxidation of one glucose molecule?

A. 18 B. 28 C. 38 D. 48

Q5: What is the end product of glycolysis?

A. Pyruvate B. Acetyl-CoA C. Lactic acid D. Ethanol

Q6: Which step of respiration produces the most ATP?

A. Glycolysis B. Link reaction C. Krebs cycle D. Electron transport chain

Q7: Where does the Krebs cycle occur?

A. Cytoplasm B. Nucleus C. Mitochondrial matrix D. Endoplasmic reticulum

Q8: Which compound acts as the final electron acceptor in aerobic respiration?

A. Oxygen B. Carbon dioxide C. ATP D. NADH

Q9: Which of the following is not a product of the Krebs cycle?

A. ATP B. NADH C. FADH2 D. Glucose

Q10: Which of the following produces alcohol during fermentation?

A. Muscle cells B. Yeast C. Mitochondria D. Chloroplasts

Q11: What is the net gain of ATP from glycolysis?

A. 2 B. 4 C. 6 D. 8

Q12: In anaerobic respiration in muscles, pyruvate is converted into:

A. Lactic acid B. Ethanol C. Acetyl-CoA D. Carbon dioxide

Q13: Which pathway takes place in both aerobic and anaerobic respiration?

A. Krebs cycle B. Glycolysis C. ETC D. Photophosphorylation

Q14: How many carbon atoms are there in a molecule of glucose?

A. 4 B. 5 C. 6 D. 8

Q15: The energy currency of the cell is:

A. Glucose B. ATP C. NADPH D. DNA

Q16: Which coenzyme is reduced during glycolysis?

A. NAD+ B. FAD C. ATP D. ADP

Q17: Which of the following is a 6-carbon intermediate of the Krebs cycle?

A. Oxaloacetate B. Citrate C. Malate D. Succinate

Q18: FADH2 donates electrons to which complex in the ETC?

A. Complex I B. Complex II C. Complex III D. Complex IV

Q19: What is the total number of NADH molecules produced per glucose molecule during aerobic respiration?

A. 8 B. 10 C. 12 D. 14

Q20: Which part of respiration is also called the citric acid cycle?

A. Glycolysis B. Link reaction C. Krebs cycle D. ETC