Practice free Respiration (Botany) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
When carbohydrates are used as a respiratory substrate, they are typically first converted into:
The NCERT states: 'Glucose is the favoured substrate for respiration. All carbohydrates are usually first converted into glucose before they are used for respiration.'
The interrelationship among metabolic pathways showing respiration-mediated breakdown of different organic molecules to CO2 and H2O (Figure 12.6, not provided here but referred to in text) visually represents:
Given the discussion of respiration as an amphibolic pathway and the description of various substrates entering at different points, the figure would illustrate how these pathways converge and diverge, supporting both breakdown and synthesis, hence its amphibolic nature.
Which of the following describes the cellular location where pyruvate is transported for its conversion to Acetyl CoA in aerobic respiration?
According to the NCERT text, 'For aerobic respiration to take place within the mitochondria, the final product of glycolysis, pyruvate is transported from the cytoplasm into the mitochondria.' Specifically, Pyruvate, after it enters the mitochondrial matrix, undergoes oxidative decarboxylation.
The conversion of pyruvic acid to Acetyl CoA is an example of:
The NCERT states, 'Pyruvate, which is formed by the glycolytic catabolism of carbohydrates in the cytosol, after it enters mitochondrial matrix undergoes oxidative decarboxylation.' This process involves both oxidation (reduction of NAD+) and decarboxylation (release of CO2).
The Pyruvate Dehydrogenase complex requires the participation of several coenzymes. Which of the following is explicitly mentioned in the NCERT text as a required coenzyme for this complex?
The NCERT states, 'The reactions catalysed by pyruvic dehydrogenase require the participation of several coenzymes, including NAD+ and Coenzyme A.' FAD+ is involved later in the TCA cycle, and ATP/GTP are products or used in other steps, not coenzymes for this specific reaction.
The product 'Acetyl CoA' formed from pyruvic acid is crucial because it directly enters which metabolic pathway?
The NCERT states, 'The acetyl CoA then enters a cyclic pathway, tricarboxylic acid cycle, more commonly called as Krebs’ cycle'.
The enzyme responsible for catalyzing the oxidative decarboxylation of pyruvic acid is:
The NCERT clearly states, 'Pyruvate... undergoes oxidative decarboxylation by a complex set of reactions catalysed by pyruvic dehydrogenase.'
Which of the following is NOT a direct product of the Pyruvate Dehydrogenase complex reaction (from one molecule of pyruvic acid)?
The reaction shows: Pyruvic acid + CoA + NAD+ $\xrightarrow{\text{Pyruvate dehydrogenase}}$ Acetyl CoA + CO2 + NADH + H+. ATP is not directly produced in this step; it is generated later through oxidative phosphorylation using the NADH. The question specifically asks for DIRECT product for one molecule of pyruvic acid. So, ATP is not a direct product.
What is the key role of NAD+ in the conversion of pyruvate to Acetyl CoA?
In the reaction, NAD+ is converted to NADH + H+, indicating that NAD+ acts as an electron and hydrogen ion acceptor, undergoing reduction. This is an oxidative step for pyruvate.
Which of the following components of ATP synthase contains the site for ATP synthesis from ADP and inorganic phosphate?
The F1 headpiece is a peripheral membrane protein complex and contains the site for synthesis of ATP from ADP and inorganic phosphate, as stated in the NCERT text.
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.