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molecule

molecule

209 3.4
A group of atoms joined together that forms the smallest part of a substance that can react
  • noun
  • /ˈmɑlɪˌkjul/
  • Specialized
translation icon : molécula
  • A glucose molecule plays a crucial role in providing energy to living cells.
  • atoms and molecules
  • water molecule
  • oxygen molecules

Researchers build a transistor from a molecule and a few atoms.

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Examples

  • Water is made up of two hydrogen atoms and one oxygen atom, forming a single molecule.

  • So let's assume this is a DNA molecule that is not helical yet.

  • Your hands and our molecules are certainly not the same.

  • With every cell, with every molecule, with every atom.

  • These are these large biological molecules that do amazing things.

  • And it's based on us, our own molecules, our own cells, our own genes.

  • One of these small molecules was penicillin.

  • Six molecules of water... plus six molecules of carbon dioxide... produces one molecule of sugar and six molecules of oxygen.

  • As you know, DNA is a helical molecule made-up of two strands.

  • In chemistry, a molecule is the smallest unit of a chemical compound that can take part in a reaction.

Compounds

protein molecule
  • Specialized
1 3.9

A long chain of amino acids that helps cells work and keep their shape

dipole molecule
  • Specialized
7.4

A molecule with one end always positive and the other always negative

long-chain molecule
  • Specialized
6.1

A very large group of atoms joined together in a long chain like in proteins or plastics

How Small

atom
  • Specialized
170 3.5
molecule
  • Specialized
209 3.4
nanoparticle
  • Specialized
10 6.5
particle
  • Specialized
447 4.2

Surface Forms

molecule singular
molecules plural

Etymology

Molecule comes from the Latin word moles meaning 'mass' plus the small ending -cule, so it literally means a 'tiny mass'. That's why a molecule today is a very small group of atoms — the smallest 'bit' of a compound that can take part in a chemical reaction.