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 require an external source of energy, such as glucose or sunlight, for metabolic energy.

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