Prepare for NEET Biology Respiration in Plants (Aerobic Respiration) with MCQs & PYQs on NEET.GUIDE. Access free practice, previous year questions, and expert guidance to examine Krebs cycle, electron transport chain, and ATP yield.
NEET Questions / Botany / Respiration in Plants / Aerobic Respiration
During aerobic respiration, the complete oxidation of one molecule of glucose theoretically yields 38 ATP. However, the actual yield is often lower. Which of the following is NOT a significant contributor to this reduced ATP yield?
Incomplete oxidation of glucose in the cytoplasm
Leakage of protons across the inner mitochondrial membrane
Utilization of the proton gradient for processes other than ATP synthesis
Variations in the efficiency of the electron transport chain
Which specific component of the electron transport chain is directly responsible for the reduction of oxygen to water during aerobic respiration?
NADH dehydrogenase
Succinate dehydrogenase
Cytochrome bc1 complex
Cytochrome c oxidase
If the inner mitochondrial membrane were to become permeable to protons, what would be the MOST immediate consequence on ATP synthesis?
ATP synthesis would increase due to increased proton flow.
ATP synthesis would stop because the proton gradient would dissipate.
ATP synthesis would be unaffected as it relies on substrate-level phosphorylation.
ATP synthesis would decrease, but some ATP would still be produced by glycolysis.
A researcher is studying a novel inhibitor that specifically targets the F0 subunit of ATP synthase. What is the most likely direct effect of this inhibitor on aerobic respiration?
Increased electron transport chain activity
Inhibition of proton flow through the inner mitochondrial membrane
Enhanced ATP production
Stimulation of Krebs cycle activity
Under anaerobic conditions, the regeneration of NAD+ for glycolysis is primarily achieved through:
The electron transport chain
Formation of lactate or ethanol
The Krebs cycle
Oxidative phosphorylation
In the context of aerobic respiration, uncoupling agents like 2,4-dinitrophenol (DNP) disrupt ATP synthesis by:
Inhibiting the electron transport chain
Dissipating the proton gradient across the inner mitochondrial membrane
Blocking the binding of NADH to Complex I
Inhibiting the activity of ATP synthase directly
During aerobic respiration, the maximum number of ATP molecules are generated during which stage?
Glycolysis
Krebs cycle
Oxidative phosphorylation
Link reaction
Which of the following is NOT a direct product of the Krebs cycle?
FADH2
NADH
ATP synthase
CO2
In the electron transport chain, electrons are passed from one carrier to another. What is the primary reason for this sequential transfer?
To produce water directly
To regenerate NAD+ and FAD
To release energy in a controlled manner to create a proton gradient
To directly phosphorylate ADP to ATP
The final electron acceptor in the electron transport chain of aerobic respiration is:
Water
Carbon dioxide
Oxygen
NAD+
