In cellular metabolism, reactions where small precursor molecules are assembled into larger, more complex organic macromolecules are called what?

Introduction / Context:
Cells must build macromolecules such as proteins, nucleic acids, complex lipids, and polysaccharides. The energy-requiring processes that assemble these from simpler precursors are core to growth, replication, and adaptation.

Given Data / Assumptions:

• Small precursors are converted into larger molecules.
• The question asks for the correct term for these constructive reactions.
• Standard biochemical definitions apply.

Concept / Approach:
Anabolism comprises biosynthetic pathways that consume ATP and reducing power (for example, NADPH) to form complex products. This is contrasted with catabolism, which breaks down substrates and typically yields energy and reducing equivalents.

Step-by-Step Solution:

Verification / Alternative check:
Biochemical maps (for example, amino acid, nucleotide, and lipid biosynthesis) are classic anabolic routes supported by ATP and NADPH.

Why Other Options Are Wrong:

• Catabolism: degradative; opposite direction.
• Metabolism/any of these: too broad; the question asks for a precise term.

Common Pitfalls:
Confusing “metabolism” with “anabolism”; metabolism includes both anabolic and catabolic networks.

Final Answer:
anabolism