17. A culture of Spirogyra (an autotrophic alga) is maintained in a water solution containing dissolved carbon dioxide and a source of phosphates but lacking nitrogen compounds. A researcher determines the rates of synthesis of several organic compounds found in the Spirogyra before and after several weeks in the water solution. Which of the following graphs best illustrates a likely result of the experiment? (A) O Before I After Carbohydrates Proteins Lipids Nucleic Acids Orpanic Compounds (B) 14 O Before I After 12 Carbohydrates Proteins Lipids Nucleic Acids Orpanic Compounds (C) 14 12 O Before After Carbohydrates Proteins Lipids Nucleic Acids Organic Compounds (D) 14 O Before I After 12 Carbohydrates Proteins Lipids Nucleic Acids Organic Compounds

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Metabolic pathways

Metabolism is defined as the group of life-supporting, enzyme-mediated chemical reactions in organisms. A metabolic pathway is a set of these chemical reactions that involve anabolism (synthesis of complex biomolecules) and catabolism (breakdown of biomolecules into small molecules) that occur inside a cell. Metabolites are the reacting substances, products, and intermediate substances of an enzymatic process that are altered by a series of chemical events catalyzed by enzymes.