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.
ADN - Genetic polymer
Supports genetic info, double helix structure.
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.
Answer 11 questions on The Logic of Life.
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?
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