What is an atom composed of?
A nucleus of protons and neutrons surrounded by an electron cloud.
Atom - Basic unit of matter
Consists of protons, neutrons, electrons.
What is a molecule made of?
At least two atoms joined by covalent bonds and electrically neutral.
Molecule - Covalently bonded atoms
Made of at least two atoms, 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.
ADN - Genetic polymer
Supports genetic info, double helix structure.
What distinguishes microscopic from macroscopic structures?
Microscopic structures are invisible to the naked eye, macroscopic are visible and larger than 1 mm.
ATP - Energy currency
Hydrolysis provides energy for reactions.
Supramolecular assembly
Macromolecules held by weak bonds.
Cell - Basic living unit
Bounded by membrane, contains DNA.
Gene - Genetic information unit
Made of DNA, determines traits.
Test your knowledge with 11 questions on The Logic of Life.
1. Which structure distinguishes an atom from a molecule?
2. What is an atom in the context of molecular biology?
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