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Metabolism is defined as the enzyme-catalyzed chemical reactions that sustain life, including energy conversion, biosynthesis of macromolecules, and waste excretion.
Metabolism is the set of life-sustaining, enzyme-catalyzed chemical reactions occurring within living organisms. Its core roles include converting energy from food into a usable form for cellular processes, converting nutrients into building blocks for macromolecules (such as proteins, lipids, nucleic acids, and some carbohydrates), and eliminating metabolic waste. Metabolism also encompasses digestion and transport of substances between cells, and within cells it is often described as intermediary (intermediate) metabolism. Metabolic reactions are organized into pathways where one compound is transformed step-by-step into another, with each step typically driven by a specific enzyme. Two major functional categories are catabolism (breaking down compounds, often releasing energy) and anabolism (building complex molecules, typically consuming energy). Enzymes are crucial because they enable reactions that would otherwise not proceed efficiently, and they allow regulation of reaction rates in response to environmental changes and cellular signals, supporting growth, reproduction, structure maintenance, and adaptation.
Metabolism is defined as the enzyme-catalyzed chemical reactions that sustain life, including energy conversion, biosynthesis of macromolecules, and waste excretion.
Metabolic pathways connect reactions step-by-step, with catabolism generally releasing energy and anabolism generally consuming it.
Enzymes both accelerate metabolic reactions and regulate their rates, enabling organisms to maintain homeostasis and respond to signals.
The set of life-sustaining chemical reactions in living organisms that convert nutrients into energy, biomolecular building blocks, and waste products.
The metabolic breakdown of larger molecules into smaller ones, often releasing energy that can be used for other processes.
The metabolic construction of complex molecules from simpler precursors, typically requiring energy input.
A sequence of linked biochemical reactions in which one molecule is transformed into another step-by-step, usually by specific enzymes.
A catalyst that speeds up metabolic reactions and helps regulate their rates in response to cellular conditions and signals.
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