Answer :
Final answer:
Anabolic pathways require energy to synthesize complex molecules from simpler ones. They are crucial for the life of the cell and happen constantly, using energy from ATP and other high-energy molecules. Meanwhile, catabolic pathways generate energy by breaking down large molecules.
Explanation:
The correct answer to your question is B. Anabolic pathways. These are the pathways that require an input of energy to synthesize complex molecules from simpler ones. This process is critical to the life of the cell and takes place constantly.
Examples of anabolism include the synthesis of sugar from CO₂, the creation of large proteins from amino acid building blocks, and the generation of new DNA strands from nucleic acid blocks. These processes require the energy supplied by ATP and other high-energy molecules like NADH (nicotinamide adenine dinucleotide) and NADPH.
In contrast, catabolic pathways generate energy by breaking down larger molecules. Both types of pathways, anabolic and catabolic, are necessary for maintaining the cell's energy balance.
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