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Biology E What is ecdysone ? A juvenile steroid hormone that affects arthropods and that belongs to the larger class of ecdysteroids, sterol derivatives that as a whole affect a variety of conditions relating to molting and metamorphosis, including eliciting molting, regulating growth of motor neurons, controlling choriogenesis, stimulating growth and development of imaginal discs, initiating breakdown of larval structures during metamorphosis, and eliciting the deposition of cuticle by the epidermis. In insects, ecdysone primarily elicits and stimulates molting. It acts on specific genes, stimulating the synthesis of proteins involved in these bodily changes, and is produced by prothoracic glands in insects and Y-organs (a gland near the external adductor muscles) in crustaceans. Ecdysone—formerly called alpha ecdysone, and beta ecdysone, or ecdysterone (now called 20-hydroxyecdysone [20-HE])—is believed to be the active form. Ecdysone is not the active molting hormone. Various ...

List of Language

Language what is language? A language is used by humans to communication based on gesture and speech,sign or writing .The scientific study of language is called linguistics . The number of human language in the world between 5000 to 7000.Some laguages are spoken by very few people.Less then 500 peaple speaks a language called Liv. One African language ,bikya,could have only one surviving speaker. the world most spoken language is chinese ,which is used every day by 1.2 billion people .English is the world's most widespread language,spoken by 470,million people in the world.Natural languages are spoken or signed ,but any language can be encoded into secondary media using auditory, visual, or tactile stimuli(connected with sense of touch) – for example, in writing, whistling, signing, or braille. All languages rely on the process of semiosis to relate signs to particular meanings. Oral, manual and tactile languages contain a phonological system that governs h...

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Biology questions and answers A to Z

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