Metabolism and the Krebs Cycle

What is the main function of the Krebs Cycle?

• To produce ATP

• To convert glucose into pyruvate

• To generate NADH and FADH2

• To synthesize amino acids

Which molecule is the primary supplier of the Krebs Cycle?

• Acetyl-CoA

• Pyruvate

• Oxaloacetate

• Glutamate

What is the final product of the Krebs Cycle?

• CO2

  ATP

  NADH

  FADH

• H2O

• Glucose

• Only ATP

Which enzyme catalyzes the condensation of acetyl-CoA and oxaloacetate?

• Citrato synthase

• Isocitrate dehydrogenase

• Succinyl-CoA synthetase

• Malate dehydrogenase

What is the role of NADH and FADH2 in the Krebs Cycle?

• They provide reducing power to the electron transport chain

• They convert pyruvate into acetyl-CoA

• They synthesize ATP directly

• They convert oxaloacetate into malate

Which step of the Krebs Cycle produces GTP?

• Conversion of succinyl-CoA to succinate

• Conversion of citrate to isocitrate

• Conversion of malate to oxaloacetate

• Conversion of fumarate to malate

What happens to the activity of the Krebs Cycle when NADH levels are high?

• The activity decreases

• The activity increases

• There is no effect

• The cycle stops completely