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The Archaea (Also known as Archea) are a group of single-celled organisms. The name comes from Greek αρχαία, “old ones”. They are a major division…

The atom is the basic unit of matter. An atom is the smallest unit of matter that retains all of the chemical properties of an…

An atomic mass is the mass of a single atom of a chemical element. the mass of an atom of a chemical element expressed in…

Stonehenge is a prehistoric stone circle monument, cemetery, and archaeological site in Wiltshire, England, two miles (3 km) west of Amesbury. It consists of a…

The Nazca Lines /ˈnæzkɑː/ are a collection of giant geoglyphs designs or motifs etched into the ground located in the Peruvian coastal plain about 250…

Amino acids are the building blocks of proteins. The term ‘amino acid’ is short for α-amino [alpha-amino] carboxylic acid. In eukaryotes, there are 20 standard…

An antibiotic (or antibacterial) is a chemical compound that kills bacteria or slows their growth. They are used to treat bacterial infections. They are used…

Antibodies (also called immunoglobulins) are large Y-shaped proteins that can stick to the surface of bacteria and viruses. They are proteins produced and secreted by…

An indirect tax is charged on producers of goods and services and is paid by the consumer indirectly. These taxes tend to take a higher…

An alpha helix (also known as, α-helix) is a type of secondary structure. It focuses on the description of how the main chain of a…

Allotropy (also known as allotropism) is when a chemical element can exist in two or more different forms in the same physical state or phase.…

The alkaline earth metals are the second group of metals on the periodic table. They are all of the elements in the second column (column…