Kaplan Nursing Entrance Practice Exam 2026 – The All-in-One Guide to Exam Success!

Proteins play a crucial role in carrying out cellular functions, which encompasses a wide range of activities essential for maintaining life. They act as enzymes that catalyze biochemical reactions, facilitating processes such as digestion and metabolism. Proteins also contribute to the structure and function of cells by forming key components of cellular machinery, including signaling pathways and transport mechanisms.

Moreover, proteins are involved in the immune response, helping the body recognize and respond to pathogens. They can also serve as transport molecules, carrying nutrients and oxygen throughout the body. This multifaceted role underscores the importance of proteins not just as building blocks of cells, but as dynamic entities critical in various biochemical processes that sustain life.

While proteins can serve as a secondary source of energy under certain conditions, they primarily function to support and regulate the biological processes essential for health. The other options, such as energy provision, genetic storage, and membrane formation, represent functions related to carbohydrates, nucleic acids, and lipids respectively, rather than the primary role of proteins in cellular function.