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ABC model

Overview page. Subjects: Chemistry — Biological Sciences.

A model to explain the genetic control of floral organ determination during flower development. It proposes that the four principal organs – sepals, petals, stamens, and carpels – are...

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ABC transporter

Overview page. Subjects: Genetics and Genomics — Chemistry.

A family of proteins that span the plasma membranes of cells and function to transport specific molecules into or out of the cell. The name is an abbreviation of ATP-Binding Cassette. ABC...

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ABO system

Overview page. Subjects: Biological Sciences — Chemistry.

One of the most important human blood group systems. The system is based on the presence or absence of antigens A and B on the surface of red blood cells and antibodies against these in...

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abortive transduction

Overview page. Subjects: Chemistry — Genetics and Genomics.

Failure of a transducing exogenote to become integrated into the host chromosome, but rather existing as a nonreplicating particle in only one cell of a clone. See transduction.

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accessory pigment

Overview page. Subjects: Chemistry — Biological Sciences.

A photosynthetic pigment that traps light energy and channels it to chlorophyll a, the primary pigment, which initiates the reactions of photosynthesis. Accessory pigments include the...

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acid growth theory

Overview page. Subjects: Biological Sciences — Chemistry.

A theory, originally proposed in 1970 by R. Cleland, A. Hager, and co-workers, that describes how auxins stimulate cell expansion in certain plant tissues, notably in coleoptiles of cereals...

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acidic amino acid

Overview page. Subjects: Chemistry — Genetics and Genomics.

An amino acid (q.v.) having a net negative charge at neutral pH. Those universally found in proteins are aspartic acid and glutamic acid, which bear negatively charged side chains in the pH...

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acriflavin

Overview page. Subjects: Chemistry — Genetics and Genomics.

An acridine dye that produces reading frame shifts (q.v.).

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acrosome

Overview page. Subjects: Biological Sciences — Chemistry.

A thin-walled vesicle that forms a cap on the head of a spermatozoon. On contact with an ovum it bursts, releasing powerful hydrolytic enzymes which cause a localized softening of the...

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action spectrum

Overview page. Subjects: Chemistry — Biological Sciences.

A graph of the efficiency of different wavelengths of light in promoting a given photoresponse, as in photosynthesis or heliotropism.

http://users.rcn.com/jkimball.ma.ultranet/Biol...

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