Kaplan Nursing Entrance Exam Practice 2026 – Comprehensive Prep

The term 'biological molecules' specifically refers to the complex structures that are fundamental to the structure and function of living organisms. These molecules include carbohydrates, lipids, proteins, enzymes, and nucleic acids. Each type of biological molecule plays a critical role within biological systems:

- Carbohydrates serve as energy sources and structural components.

- Lipids, which include fats and oils, are vital for energy storage and forming cell membranes.

- Proteins are essential for almost all biological processes, including catalyzing biochemical reactions as enzymes and providing structural support.

- Nucleic acids, such as DNA and RNA, are crucial for storing and transmitting genetic information.

These macromolecules are involved in the processes that sustain life, making them integral to biological science.

In contrast, other choices describe substances that do not align with the characteristics and functions of biological molecules. Metallic compounds, simple elements, and organic substances that do not interact with water do not encompass the complexity and functionality required to be classified as biological molecules. This detailed understanding emphasizes the importance of biological molecules in the context of living organisms and their interactions.