Units of measurement aren't made up of anything.
The smallest unit of measurement is the Plank unit - 10^-35m.
The smallest sub atomic particle is a Neutrino, and it is made up of, a Neutrino!
An atom.
When you consider the composition of living and non living things, both can be broken down into what comprises them. If one considers non-living matter, then "particle" may be used to describe the smallest unit. As knowledge advances, a "particle" by definition has evolved i.e., quarks being the smallest "particle" of an atom whereas for years it was thought that the atom was the smallest unit of matter. Conversely, the cell is considered the smallest unit of organic (living) matter The only major difference between them is that a cell is the smallest particle of a living object and a molecule (made up of atoms) is the smallest unit of a nonliving object.
The smallest unit of measured length marked on a 300mm rule is 1mm.
Heredity is the passing of traits to offspring (from its parent or ancestors).That being said, the smallest unit of Heredity is a gene, because a gene is the smallest unit capable of conveying a genetic message. Technically the smallest unit of heredity is a cistron, but that's essentially the same as a gene.I would have said a nucleotide, but a single nucleotide can't convey a hereditary message.
cell
The smallest unit of matter is an atom, which is made up of protons, neutrons, and electrons. Protons and neutrons are made up of quarks, while electrons are thought to be fundamental particles.
For covalently bonded particles, the smallest identifiable unit of a compound is a molecule. For ionic compounds, the smallest identifiable unit of a compound is a formula unit.
atom
The smallest living unit is the cell, which is made up of molecules, which in turn is made up of atoms, but neither molecules nor atoms are alive.
A 'compound'.
A compound is a substance made up of elements that have combined; a molecule is the smallest unit of which the compound is made.
cluster
compound
a compound
The smallest unit of matter that can enter into a chemical reaction is an atom. This is the smallest unit of chemical matter.The smallest unit of matter in all is believed to be a fermion.Matter is made up of molecules, which are made up of various atoms. Atoms are made of neutrons, protons and electrons. Protons and neutrons are made up of both quarks and gluon (think of gluon as the "glue" that holds together quarks). Electrons are made from leptons. Both leptons and quarks are types of fermions.There are some even smaller, theorized, units such as the tachyon-- and the smallest unit of matter might not be a unit at all, but rather a vibration.
an atom
Amino acids are the elementary bricks of proteins.