Anabolism results from _______ of complex substances in the cell from _______.

Question

BlackTom AI · Accepted Answer

Anabolism is the biosynthetic buildup of complex molecules from simpler precursor molecules, so the correct phrase is "buildup; simpler substances."

1) Relevant knowledge points and concepts
- Metabolism has two complementary branches: anabolism (constructive) and catabolism (destructive).
- Anabolism uses energy (usually ATP and reducing power such as NADPH) to form macromolecules: proteins, polysaccharides, lipids, and nucleic acids.
- Monomers (amino acids, simple sugars, fatty acids, nucleotides) are the simpler substances assembled into polymers during anabolism.
- Catabolism is the breakdown of complex molecules into simpler ones, releasing energy.

2) Step-by-step reasoning
- Identify the definition: Anabolism = synthesis of complex cellular components.
- Determine directionality: Synthesis implies buildup (not breakdown).
- Identify substrates and products: Simple building blocks (simpler substances) are joined to form complex substances (macromolecules).
- Therefore the sentence should read: "Anabolism results from buildup of complex substances in the cell from simpler substances."

3) Calculations
- No numerical calculations are required for this conceptual question.

4) Why the correct answer is correct
- "Buildup; simpler substances" accurately captures that anabolic pathways construct complex biomolecules by chemically linking simpler units, driven by input of energy and reducing equivalents.

5) Why other options are incorrect (brief)
- "movement; inside the nucleus": Anabolism is not about movement and is not confined to the nucleus.
- "buildup; mitochondria": While mitochondria generate ATP used by anabolism, anabolic synthesis is not specifically "from mitochondria"—it uses simple precursors distributed throughout the cell.
- "breakdown; protein": That describes catabolism (breakdown), and proteins are products of anabolism, not the substrate phrase sought.
- "breakdown; inside organelles": Again this describes catabolic processes, not anabolic synthesis.

6) Conclusion
This reasoning confirms the correct answer is "buildup; simpler substances," matching the provided answer.

Anabolism results from _ of complex substances in the cell from _.单项选择题

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Anabolism results from _______ of complex substances in the cell from _______.单项选择题