Questions: Multiple Choice Question Which is the main role of proteins in cells? Long term energy molecules. Contain genetic information. Structural and functional molecules. Quick energy source for the cell. Need help? Review these concept resources.

The answer is the third one: Structural and functional molecules.

Explanation for each option:

1. Long term energy molecules: This is incorrect. Long-term energy storage in cells is primarily the role of lipids, such as fats and oils, not proteins.

2. Contain genetic information: This is incorrect. Genetic information is stored in nucleic acids, such as DNA and RNA, not proteins.

3. Structural and functional molecules: This is correct. Proteins play a crucial role in cells by serving as structural components (e.g., collagen in connective tissues) and functional molecules (e.g., enzymes that catalyze biochemical reactions, transport proteins, and antibodies).

4. Quick energy source for the cell: This is incorrect. Quick energy sources for cells are typically carbohydrates, such as glucose, not proteins.

Summary: Proteins are essential for the structural integrity and functionality of cells, making them the main structural and functional molecules within cellular systems.