The immediate source of energy for cellular metabolism is

Explanation

ATP (adenosine triphosphate) is the immediate source of energy for cellular metabolism because it directly powers cellular activities by releasing energy upon the hydrolysis of its phosphate bonds. Other options, such as lipids and carbohydrates, are involved in energy storage and production but do not directly provide immediate energy to cells. Lipids are used for long-term energy storage, carbohydrates are metabolized to produce ATP, and proteins primarily serve structural and functional roles, not as direct energy sources.