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  2. Lipid molecules of this composition spontaneously form aggregate structures such as micelles and lipid bilayers, with their hydrophilic ends oriented toward the watery medium and their hydrophobic ends shielded from the water.

  3. Fatty acid, important component of lipids in plants, animals, and microorganisms. Generally, a fatty acid consists of a straight chain of an even number of carbon atoms, with hydrogen atoms along the length of the chain and at one end of the chain and a carboxyl group (—COOH) at the other end.

  4. Nucleic acid | Definition, Function, Structure, & Types |...

    www.britannica.com/science/nucleic-acid

    What is the basic structure of a nucleic acid? Nucleic acids are long chainlike molecules composed of a series of nearly identical building blocks called nucleotides . Each nucleotide consists of a nitrogen-containing aromatic base attached to a pentose (five-carbon) sugar, which is in turn attached to a phosphate group.

  5. Cell - Lipids, Phospholipids, Membranes | Britannica

    www.britannica.com/science/cell-biology/Membrane-lipids

    Membrane lipids are principally of two types, phospholipids and sterols (generally cholesterol). Both types share the defining characteristic of lipids—they dissolve readily in organic solvents—but in addition they both have a region that is attracted to and soluble in water. This “amphiphilic” property (having a dual attraction; i.e ...

  6. Lipid - Structure, Function, Types | Britannica

    www.britannica.com/science/lipid/Lipids-in-biological-membranes

    All the lipids are amphipathic, with their hydrophilic (polar) and hydrophobic (nonpolar) portions located at separate parts of each molecule. As a result, the lipid components of membranes are arranged in what may be called a continuous bimolecular leaflet, or bilayer.

  7. Membrane lipids are principally of two types, phospholipids and sterols (generally cholesterol). Both types share the defining characteristic of lipids—they dissolve readily in organic solvents—but in addition they both have a region that is attracted to and soluble in water.

  8. Lipids, another key biomolecule of living organisms, fulfill a variety of roles, including serving as a source of stored energy and acting as chemical messengers. They also form membranes , which separate cells from their environments and compartmentalize the cell interior, giving rise to organelles , such as the nucleus and the mitochondrion ...

  9. Steroids are natural or synthetic organic compounds with a molecular structure of 17 carbon atoms arranged in four rings. They include sex hormones, adrenal cortical hormones, bile acids, and sterols.

  10. Cell, in biology, the basic membrane-bound unit that contains the fundamental molecules of life and of which all living things are composed. A single cell may be a complete organism in itself, such as a bacterium, or it may acquire a specialized function, becoming a building block of a multicellular organism.

  11. Sterol | chemical compound | Britannica

    www.britannica.com/science/sterol

    Sterols are unique among lipids in that they have a multiple-ring structure. The well-known sterol cholesterol is found only in foods of animal origin—meat, egg yolk, fish, poultry, and dairy products.

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    chemical structure of lipidsclassification of lipids