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1. Mitochondria are called the powerhouses of the cell. Which of the following observations support this statement?
A. Mitochondria are found in almost all plant and animal cells.
B. The enzymes of the Krebs cycle and the cytochromes are found in mitochondria.
C. Mitochondria synthesise ATP.
D. Mitochondria have a double membrane.
2. Which of the following is essential for the conversion of pyruvic acid to acetyl CoA?
A. ATP
B. TPP
C. LAA
D. NAD
3. The TCA cycle is named after
A. Robert Emerson
B. Melvin Calvin
C. Embden
D. Hans Krebs
4. In which of the following do the two names refer to one and the same thing?
A. Krebs cycle and Calvin cycle
B. Citric acid cycle and Calvin cycle
C. Tricarboxylic acid cycle and citric acid cycle
D. Tricarboxylic acid cycle and urea cycle
5. Pyruvic acid, the key product of glycolysis, can have many metabolic fates. Under aerobic conditions, it forms
A. CO2
B. CO2+ H2O
C. Lactic acid
D. Acetyl CoA + CO2
6. End-product of citric acid/Krebs cycle is
A. Citric acid
B. CO2 + H2O
C. Lactic acid
D. Pyruvic acid
7. Choose the correct statement.
A. There is a complete breakdown of glucose during fermentation.
B. Pyruvate is formed in the mitochondrial matrix.
C. During the conversion of succinyl CoA to succinic acid, a molecule of ATP is synthesised.
D. Oxygen is vital in respiration for the removal of hydrogen.
8. Which of the following is the key intermediate compound linking glycolysis to the Krebs cycle?
A. ATP
B. Malic acid
C. Acetyl CoA
D. NADH
9. Which of the following is not correct about the Krebs cycle?
A. It starts with a six-carbon compound.
B. It occurs in mitochondria.
C. It is also called the citric acid cycle.
D. The intermediate compound which links glycolysis with the Krebs cycle is malic acid.
10. Most of the enzymes of the TCA cycle are present in
A. Intermembrane space of mitochondria
B. Mitochondrial matrix
C. Inner membrane of mitochondria
D. Cytoplasm
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