GenBio v3

What happens during the link reaction, which connects glycolysis to the Krebs cycle?

• Nothing

• Water is formed

• ATP is produced

• Acetyl-CoA is produced

What are the products generated from the Krebs cycle?

• ATP, NADH, FADH₂, and CO₂

• ADP, NAD⁺, FAD, and H₂O

• ATP, NAD⁺, FADH₂, and CO₂

• ATP, ADP, H₂O, and CO₂

During glycolysis, the link reaction, and the Krebs cycle, NADH is produced. The Krebs cycle also generates FADH₂. What is the function of these molecules?

• Nothing at all.

• To produce CO₂ to breathe out.

• To carry electrons to the electron transport chain.

• To provide the ADP and phosphate that are needed to make ATP.

Which gas is generated by the link reaction and Krebs cycle?

• Carbon dioxide

• Hydrogen

• Oxygen

• Methane

What occurs as electrons travel down the electron transport chain?

• The electrons combine with water to form oxygen gas.

• The electrons are combined with ADP and phosphate to create ATP.

• Their energy is used to pump hydrogen ions across the mitochondrial inner membrane.

• Their energy is used to pump sodium ions across the mitochondrial inner membrane.

What is the primary role of acetyl-CoA in the Krebs cycle?

• To combine with oxaloacetate to form citrate

• To donate electrons to the electron transport chain

• To initiate glycolysis

• To produce ATP directly

Which enzyme is responsible for converting pyruvate into acetyl-CoA during the link reaction?

• Isocitrate dehydrogenase

• Pyruvate kinase

• Pyruvate dehydrogenase

• Citric synthase

What is the significance of the proton gradient created during the electron transport chain?

• It facilitates the conversion of NADH to NAD⁺.

• It helps in the synthesis of glucose.

• It drives the production of ATP through chemiosmosis.

• It is used to generate carbon dioxide.

What is the main purpose of the Krebs cycle in cellular respiration?

• To synthesize proteins

• To break down fatty acids

• To generate ATP and electron carriers

• To produce glucose

Which molecule is regenerated at the end of the Krebs cycle to allow the cycle to continue?

• NADH

• Oxaloacetate

• Citrate

• Acetyl-CoA