Questions: Work in the cell or in the physical world can only be done with expenditure of energy; it is defined as the capacity to do work.
Transcript text: Work in the cell or in the physical world can only be done with expenditure of $\square$ it is defined as the capacity to do work.
Solution
Solution Steps
Step 1: Understanding the Question
The question asks for a term that is defined as the capacity to do work. This term is commonly used in physics and is related to the concept of work.
Step 2: Identifying the Term
In physics, the term that is defined as the capacity to do work is "energy." Energy is a fundamental concept that describes the ability to perform work or cause physical change.
Final Answer
The word that fills the blank is \(\boxed{\text{energy}}\).