Cellular metabolism is the process of breakdown of nutrients to produce energy; this also includes various chemical reactions that are taking place in the cell.
The energy produced may be utilised to carryout regular activities of the cell (catabolism), or to build new organic molecules (anabolism).
So, anabolism is one process of cellular metabolism, which is a build-up process. It provides the cellular components necessary for maintenance of growth and repair of the body. For example, synthesis of proteins and glycogen.
Catabolism is a break down process of organic molecules to generate energy. If blood glucose levels are high, then all cells including skeletal muscle cells generate energy by glycolysis (breakdown of glucose). That’s why taking small amount of meals 3 to 4 times in a day is good for health rather than eating lot at a time.
Thus, the options (a), (c) and (d) are incorrect.
Cellular metabolism is the process of breakdown of nutrients to produce energy; this also includes various chemical reactions that are taking place in the cell.
Therefore, the correct option is – b. Metabolism.