Practice free Respiration (Botany) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
For one molecule of ATP produced by ATP synthase, how many protons ($H^+$) pass through the F0 channel?
According to the NCERT text, 'For each ATP produced, 4H+ passes through F0 from the intermembrane space to the matrix down the electrochemical proton gradient.'
In the theoretical calculation of ATP gain during aerobic respiration of one glucose molecule, what is the net gain of ATP?
The NCERT text states, 'Hence, there can be a net gain of 38 ATP molecules during aerobic respiration of one molecule of glucose.'
Which of the following is NOT an assumption made for calculating the net gain of ATP during aerobic respiration?
The NCERT text specifies that 'None of the intermediates in the pathway are utilised to synthesise any other compound' is an assumption, making the opposite statement (o3) incorrect as an assumption.
During the conversion of succinyl-CoA to succinic acid in the TCA cycle, which molecule is synthesized through substrate-level phosphorylation?
The NCERT states, 'During the conversion of succinyl-CoA to succinic acid a molecule of GTP is synthesised. This is a substrate level phosphorylation.'
How many molecules of NADH + H+ and FADH2 are synthesized respectively during the TCA cycle for one molecule of acetyl CoA?
The NCERT states, 'Also there are three points in the cycle where NAD+ is reduced to NADH + H+ and one point where FAD+ is reduced to FADH2.'
What is the primary role of NADH + H+ and FADH2 synthesized during glycolysis and the TCA cycle?
The NCERT states, 'The following steps in the respiratory process are to release and utilise the energy stored in NADH+H+ and FADH2. This is accomplished when they are oxidised through the electron transport system...'
Which of the following processes yields a net gain of 2 ATP molecules and involves the reoxidation of NADH+H+ to NAD+ in anaerobic conditions?
The NCERT mentions, 'What is the net ATP s that is synthesised (calculate how many ATP are synthesised and deduct the number of ATP utilised during glycolysis) when one molecule of glucose is fermented to alcohol or lactic acid?' and also highlights the reoxidation of NADH+H+ to NAD+ in fermentation processes.
In living systems, the assumptions for calculating ATP yield are not entirely valid because:
The NCERT text states, 'But this kind of assumptions are not really valid in a living system; all pathways work simultaneously and do not take place one after another; substrates enter the pathways and are withdrawn from it as and when necessary; ATP is utilised as and when needed; enzymatic rates are controlled by multiple means.'
Where does the Electron Transport System (ETS) take place in a eukaryotic cell?
The NCERT states, 'system of electron carriers called electron transport system (ETS) located on the inner membrane of the mitochondria.'
What is the fate of $O_2$ at the end of the Electron Transport System (ETS)?
The NCERT states, 'In this process O2 is the ultimate acceptor of electrons and it gets reduced to water.'
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