Which of the following statements about metabolism are true?1) Catabolism is the process in which complex substances are broken down, yielding a net output of energy. 2) Metabolism is an integrated system in which many of the same reactions participate in degradative (catabolic) and biosynthetic (anabolic) pathways. 3) Anabolism involves the synthesis of polymeric biomolecules and complex lipids from monomers such as fatty acids and nucleotides. 4) All organisms derive raw materials and energy from organic molecules, such as glucose.

The correct answers are:

1) Catabolism is the process in which complex substances are broken down, yielding a net output of energy.

2) Metabolism is an integrated system in which many of the same reactions participate in degradative (catabolic) and biosynthetic (anabolic) pathways.

3) Anabolism involves the synthesis of polymeric biomolecules and complex lipids from monomers such as fatty acids and nucleotides.

Metabolism is defined as a set of all chemical reactions within an organism. Purposes of metabolic processes are to convert food energy into energy that is required for cellular processes, to synthesize the building blocks for proteins, lipids, nucleic acids, and some carbohydrates (macromolecules) and to eliminate nitrogenous wastes. Catabolism and anabolism are part of the metabolism that work together in order to maintain functions within the cell.

Catabolic processes (breaking down of macromolecules) are necessary for energy release (usually in the form of ATP) which is then used in anabolism-synthesis of compounds that cell needs.