Which term best defines the unit that carries out life functions within a cell?

• A. Molecules and Atoms
• B. Organelle
• C. Atomic Number
• D. Neutron

Answer: (B)

Organelles are specialized structures inside a cell that carry out its life processes. Each one has a specific job, like mitochondria producing energy, ribosomes building proteins, the nucleus storing genetic material, and lysosomes breaking down waste. Because these are distinct compartments that perform essential cellular functions, they’re the units that carry out life activities inside the cell.

Molecules and atoms are the fundamental building blocks of matter, not dedicated functional units within a cell. Atomic number and neutron are properties of atoms, not parts of the cell that execute life processes.