A pentamer is a thing composed out of five sub-units.

In chemistry, it applies to molecules made of five monomer

Monomer

A monomer is an atom or a small molecule that may bind chemically to other monomers to form a polymer; the term "monomeric protein" may also be used to describe one of the proteins making up a multiprotein complex...

s.

In biochemistry, it applies to macromolecules, in particular to pentameric proteins, made of five proteic sub-units.

In microbiology, a pentamer is one of the proteins composing the polyhedral protein shell that encloses the bacterial micro-compartments known as carboxysomes

Carboxysome

Carboxysomes are bacterial microcompartments that contain enzymes involved in carbon fixation. Carboxysomes are made of polyhedral protein shells about 80 to 140 nanometres in diameter. These compartments are thought to concentrate carbon dioxide to overcome the inefficiency of RuBisCo - the...

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See also

• penta
  Penta
  -Places:* Penta , an Italian hamlet of Fisciano * Penta di Casinca, a French municipality of Corsica* Penta, Chhattisgarh, a town in Dantewada district of Chhattisgarh, India* Penta , a small river in Lithuania-Entertainment:...
  
   prefix
• -mer
  -mer
  -mer and mer- are affixes used in the following words.-Chemistry or biochemistry:* Monomer* Dimer* Trimer* Tetramer* Pentamer* Hexamer* Heptamer* Octamer* Nonamer* Decamer* Dodecamer* Oligomer* Polymer...
  
   suffix
• Pentamerous Metamorphosis
  Pentamerous Metamorphosis
  Pentamerous Metamorphosis is an album by Global Communication originally released in 1993 on Dedicated. It is a reworking of the Blood Music album by Chapterhouse and was originally only available as a bonus CD bundled with the Chapterhouse album...
  
  , an album by Global Communication
• Pentamery (botany), a characteristic of plants having five petals (pentamerous flowers).
• Pentamerous can also refer to animals, such as crinoids