ISSA Nutritionist Practice Exam

Water is a key component of cellular structure and function, comprising a significant portion of a cell's mass. Typically, it is estimated that approximately 70 percent of a cell's mass is water. This high percentage is essential for various biological processes, including chemical reactions, nutrient transport, and maintaining cell shape and integrity. Water serves as a solvent for many biochemical reactions that occur within cells and plays a crucial role in regulating temperature and pH.

On the other hand, while options such as 50 percent, 90 percent, and 30 percent reflect different understandings of cellular hydration levels, they do not accurately represent the typical water content found in biological cells. The value of 70 percent is widely recognized in scientific literature as the standard percentage for the composition of water in cells.