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v. t. e. Cell biology (also cellular biology or cytology) is a branch of biology that studies the structure, function, and behavior of cells. [ 1][ 2] All living organisms are made of cells. A cell is the basic unit of life that is responsible for the living and functioning of organisms. [ 3] Cell biology is the study of the structural and ...
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.
Collagen ( / ˈkɒlədʒən /) is the main structural protein in the extracellular matrix of a body's various connective tissues. As the main component of connective tissue, it is the most abundant protein in mammals. [ 1] 25% to 35% of a mammalian body's protein content is collagen.
There have been efforts to put a select subset of Wikipedia's articles into printed book form. [237] [W 107] Since 2009, tens of thousands of print-on-demand books that reproduced English, German, Russian, and French Wikipedia articles have been produced by the American company Books LLC and by three Mauritian subsidiaries of the German ...
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A protein is a polyamide. Secondary structure: regularly repeating local structures stabilized by hydrogen bonds. The most common examples are the α-helix, β-sheet and turns. Because secondary structures are local, many regions of different secondary structure can be present in the same protein molecule.
The cell is the basic structural and functional unit of all forms of life. Every cell consists of cytoplasm enclosed within a membrane; many cells contain organelles, each with a specific function. The term comes from the Latin word cellula meaning 'small room'. Most cells are only visible under a microscope.
Molecular biology / məˈlɛkjʊlər / is a branch of biology that seeks to understand the molecular basis of biological activity in and between cells, including biomolecular synthesis, modification, mechanisms, and interactions. [ 1][ 2][ 3] Though cells and other microscopic structures had been observed in living organisms as early as the ...