Aerobic Respiration A Level Bio

Where does glycolysis occur in a eukaryotic cell?

• Mitochondrial matrix

• Inner mitochondrial membrane

• Cytoplasm

• Intermembrane space

What is the correct sequence of locations for the four stages of aerobic respiration?

• Cytoplasm → Outer membrane → Intermembrane space → Matrix

• Cytoplasm → Matrix → Matrix → Inner mitochondrial membrane

• Cytoplasm → Inner membrane → Matrix → Matrix

• Matrix → Cytoplasm → Inner membrane → Matrix

During glycolysis, glucose is first:

• Oxidised to CO₂

• Split directly into two pyruvates

• Phosphorylated and then split

• Combined with oxygen

What are the final products of glycolysis?

• Glucose, ATP, NAD⁺

• CO₂, ATP, FADH₂

• Pyruvate, ATP, reduced NAD

• Acetyl CoA, ATP, CO₂

What happens to pyruvate if oxygen is present?

• It is converted to ethanol

• It is transported into the mitochondrion for the link reaction

• It accumulates in the cytoplasm

• It forms lactate

What is the function of coenzyme A in the link reaction?

• It reduces pyruvate to lactate

• It transfers a phosphate group

• It transfers acetyl groups to the Krebs cycle

• It decarboxylates pyruvate

In the Krebs cycle, acetyl CoA combines with which molecule to form citrate?

• Malate

• Oxaloacetate

• Succinate

• Pyruvate

What are the key types of reactions in the Krebs cycle?

• Hydrolysis and photolysis

• Dehydration and hydrolysis

• Decarboxylation and dehydrogenation

• Oxidation and polymerisation

What is the role of NAD and FAD in aerobic respiration?

• They store carbon dioxide

• They reduce oxygen to water

• They transport hydrogen atoms to the electron transport chain

• They break down glucose

During oxidative phosphorylation, what provides energy to pump protons across the inner membrane?

• Hydrolysis of ATP

• Movement of electrons through the ETC

• Passive diffusion of hydrogen

• Binding of oxygen to NAD