NEET Biology: Amphibolic pathways Practice Questions
15 free multiple-choice questions on Amphibolic pathways (Respiration) for NEET Biology, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.
Practice thousands more NEET questions in the app →Q1. Which characteristic best describes metabolic pathways that are both catabolic and anabolic?
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Correct answer: A — amphibolic
Amphibolic pathways are those that serve both catabolic (breaking down) and anabolic (building up) functions, making them amphibolic.
Q2. In the context of amphibolic pathways, the role of metabolic intermediates is primarily to:
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Correct answer: A — Serve as precursors for biosynthesis
Amphibolic intermediates are crucial because they can be drawn off or fed into other pathways to synthesize necessary biomolecules (anabolism), linking breakdown and synthesis.
Q3. Which statement best describes the functional significance of the amphibolic pathways in cellular respiration?
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Correct answer: D — They allow the interconversion of energy-releasing catabolic reactions and energy-consuming anabolic reactions.
Amphibolic pathways are characterized by their reversibility, allowing metabolites generated during catabolism (breakdown for energy) to be used as precursors for anabolic pathways (synthesis of complex molecules), thus linking energy release with biosynthesis.
Q4. The continuous flow between catabolic and anabolic reactions within amphibolic pathways ensures that the cell can effectively manage:
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Correct answer: B — substrate availability and usage
The interconnectedness of these pathways allows the cell to dynamically manage the flow of carbon and energy, ensuring substrates are used productively for both breakdown and building up.
Q5. The primary role of amphibolic pathways in cellular metabolism is to connect which two main processes?
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Correct answer: C — Anabolism and Catabolism
Amphibolic pathways bridge catabolic processes (breaking down molecules for energy) and anabolic processes (building up complex molecules).
Q6. The breakdown of fatty acids via β-oxidation contributes energy to the cell (catabolism) and also generates acetyl-CoA, which can be used for fatty acid synthesis (anabolism). This interaction exemplifies:
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Correct answer: D — Amphibolic metabolism
Since fatty acid oxidation releases energy but produces intermediates (acetyl-CoA) used for building blocks, it is an amphibolic process.
Q7. Which set of molecules derived from the amphibolic cycle are essential precursors for the synthesis of fatty acids and steroids?
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Correct answer: D — Acetyl-CoA and Citrate
Acetyl-CoA, derived from the cycle, is the primary building block used for the synthesis of fatty acids and subsequent steroid hormones.
Q8. The overall role of the amphibolic pathways in cellular metabolism is to establish a balance between energy production and which other vital cellular process?
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Correct answer: A — Biosynthesis of macromolecules
Amphibolic metabolism links energy metabolism (catabolism) directly to the synthesis of necessary biological molecules (anabolism).
Q9. Which intermediate molecule participates in the link between the breakdown of carbon skeletons and the synthesis of new organic compounds in amphibolic metabolism?
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Correct answer: C — Acetyl-CoA
Acetyl-CoA is the central molecule that feeds into both the TCA cycle (catabolism) and subsequent pathways for synthesizing precursors (anabolism).
Q10. The conversion of acetyl-CoA into precursors for fatty acid synthesis is an example of which type of metabolic interaction?
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Correct answer: D — Amphibolic exchange
The conversion of a catabolic product (acetyl-CoA) into an anabolic precursor (fatty acids) is a key feature of amphibolic exchange.
Q11. The flow of metabolites through the amphibolic pathways is best described by which characteristic?
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Correct answer: A — Sequential entry and exit points
Amphibolic metabolism involves a complex, interconnected flow where intermediates are simultaneously used for energy generation (catabolism) and for building complex molecules (anabolism).
Q12. Which of the amphibolic pathways is primarily responsible for supplying precursors for the synthesis of macromolecules (anabolic reactions)?
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Correct answer: D — Citric Acid Cycle
The Pentose Phosphate Pathway (PPP) is a key amphibolic pathway that produces NADPH and ribose-5-phosphate, which are essential precursors for the synthesis of fatty acids, amino acids, and nucleic acids, respectively, thereby serving anabolic needs.
Q13. Which molecule links the TCA cycle to the PPP, allowing for the generation of precursors for nucleic acid synthesis?
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Correct answer: A — Oxaloacetate
Oxaloacetate, through shuttles, participates in replenishing TCA cycle intermediates and links to pathways that generate ribose-5-phosphate needed for nucleic acids.
Q14. Which of the following processes is primarily a catabolic process contributing to energy release from carbohydrate breakdown?
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Correct answer: A — Glycolysis
Glycolysis is the initial breakdown of glucose into pyruvate, which is a primary catabolic step for energy generation.
Q15. The Tricarboxylic Acid (TCA) cycle is a classic example of which type of metabolic pathway?
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Correct answer: A — Amphibolic
The TCA cycle is amphibolic because it generates energy through oxidation (catabolism) but also provides intermediates (like α-ketoglutarate and oxaloacetate) for the synthesis of amino acids and glucose (anabolism).
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