Which term describes a type of atom that makes up molecules such as carbon dioxide and energy storage molecules?

Which term describes a type of atom that makes up molecules such as carbon dioxide and energy storage molecules?

• A. Carbon
• B. Oxygen
• C. Nitrogen
• D. Hydrogen

Answer: (A)

Carbon serves as the building block for many important molecules. It can form four covalent bonds, letting it create long chains and complex structures that underpin organic molecules. Carbon dioxide is made when carbon bonds with oxygen, showing carbon’s central role in this kind of molecule. Energy storage molecules—like carbohydrates, fats, and other organic compounds—rely on carbon skeletons to hold together their backbone and functional groups. While oxygen, hydrogen, and nitrogen appear in these molecules, carbon is the key element that defines the type of atom described and enables these essential molecules to exist.

Carbon serves as the building block for many important molecules. It can form four covalent bonds, letting it create long chains and complex structures that underpin organic molecules. Carbon dioxide is made when carbon bonds with oxygen, showing carbon’s central role in this kind of molecule. Energy storage molecules—like carbohydrates, fats, and other organic compounds—rely on carbon skeletons to hold together their backbone and functional groups. While oxygen, hydrogen, and nitrogen appear in these molecules, carbon is the key element that defines the type of atom described and enables these essential molecules to exist.