Atom → molecule → macromolecule → supramolecular assembly
1. Which structure distinguishes an atom from a molecule?
2. What feature identifies ATP as a molecule that can supply energy for many metabolic reactions?
3. Which description best defines a cell?
What is an atom composed of?
A nucleus of protons and neutrons surrounded by an electron cloud.
What is a molecule made of?
At least two atoms joined by covalent bonds and electrically neutral.
What defines a cell as the unit of life?
It is a closed structure with plasma membrane, cytoplasm, and DNA, serving structural, functional, and reproductive roles.
What distinguishes microscopic from macroscopic structures?
Microscopic structures are invisible to the naked eye, macroscopic are visible and larger than 1 mm.
Atom - Basic unit of matter
Consists of protons, neutrons, electrons.
Molecule - Covalently bonded atoms
Made of at least two atoms, neutral.
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