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Molecule. Atomic force microscopy (AFM) image of a PTCDA molecule, in which the five six-carbon rings are visible. [ 1] A scanning tunneling microscopy image of pentacene molecules, which consist of linear chains of five carbon rings. [ 2] AFM image of 1,5,9-trioxo-13-azatriangulene and its chemical structure. [ 3]
A chemical compound is a chemical substance composed of many identical molecules (or molecular entities) containing atoms from more than one chemical element held together by chemical bonds. A molecule consisting of atoms of only one element is therefore not a compound. A compound can be transformed into a different substance by a chemical ...
A biomolecule or biological molecule is loosely defined as a molecule produced by a living organism and essential to one or more typically biological processes. [ 1] Biomolecules include large macromolecules such as proteins, carbohydrates, lipids, and nucleic acids, as well as small molecules such as vitamins and hormones.
Some chemical authorities define an organic compound as a chemical compound that contains a carbon–hydrogen or carbon–carbon bond; others consider an organic compound to be any chemical compound that contains carbon. For example, carbon-containing compounds such as alkanes (e.g. methane CH4) and its derivatives are universally considered ...
Lists of molecules. This is an index of lists of molecules (i.e. by year, number of atoms, etc.). Millions of molecules have existed in the universe since before the formation of Earth. Three of them, carbon dioxide, water and oxygen were necessary for the growth of life. Although humanity had always been surrounded by these substances, it has ...
Diatomic molecules (from Greek di- 'two') are molecules composed of only two atoms, of the same or different chemical elements. If a diatomic molecule consists of two atoms of the same element, such as hydrogen ( H2) or oxygen ( O2 ), then it is said to be homonuclear. Otherwise, if a diatomic molecule consists of two different atoms, such as ...
The scientists tracked many kinds of molecules in the samples, including RNA and proteins, as well as the participants’ microbiomes. The metabolic changes the researchers discovered indicate not ...
A macromolecule is a very large molecule important to biological processes, such as a protein or nucleic acid. It is composed of thousands of covalently bonded atoms. Many macromolecules are polymers of smaller molecules called monomers. The most common macromolecules in biochemistry are biopolymers ( nucleic acids, proteins, and carbohydrates ...
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