What is the reason carbon atoms are the most versatile building blocks of the molecules used by living organisms?

• A. Carbon is the central atom of carbon dioxide, a necessary molecule for photosynthesis.
• B. Carbon is the central atom in urea, a molecule used by many living organisms to transport wastes from the body.
• C. All of the listed responses are correct.
• D. Each carbon atom acts as an intersection point from which a molecule can branch off in up to four directions.

Answer: (D)

Verified step by step guidance

1. Understand the unique properties of carbon atoms that make them versatile in forming complex molecules.
2. Recognize that carbon atoms have four valence electrons, allowing them to form four covalent bonds with other atoms.
3. Visualize how these four covalent bonds enable carbon atoms to act as intersection points, creating diverse molecular structures.
4. Consider the implications of carbon's bonding capabilities in biological molecules, such as carbohydrates, proteins, lipids, and nucleic acids.
5. Reflect on how the ability to form stable and varied structures is crucial for the complexity and functionality of living organisms.