2009 organelas celulares
TRANSCRIPT
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Citosol: água + íons + pequenas moléculas + macromóléculas solúveis
Organelas: Ribossomos, REL e RER, Complexo de Golgi, Mitocôndrias, Cloroplastos, Centríolos.
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Ribossomos• Têm função de síntese protéica• Formados de RNA + proteínas
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REL e RER
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REL e RER
• RE: Conjunto de bolsas e canais membranosos que se estendem por todo o citoplasma.– REL: Não apresentam ribossomos.
Modificam substâncias químicas tóxicas e produzem fosfolipídeos, colesterol e seus derivados.
– RER: Apresentam ribossomos em sua superfície e se relacionam com a síntese protéica.
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Complexo de Golgi• Armazena, modifica e empacota proteínas• Forma os lisossomos
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Lisossomos e a Digestão Intracelular (células animais)
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AutofagiaAutofagia
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Mitocôndrias e Cloroplastos• Organelas que processam energia• Mitocôndria: produz energia (ATP) pela quebra da glicose.• Cloroplasto: Produz glicose utilizando água, gás carbônico e energia
luminosa• Segundo a teoria endosimbiótica, ambas foram células procarióticas
que invadiram a célula eucariótica nos primórdios do surgimento celular.
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Centríolos• Organelas presentes na maioria das células eucarióticas,
exceto nas gimnospermas e angiospermas.
• Formam os microtúbulos do citoesqueleto, as fibras do fuso mitótico e a base dos cílios e flagelos.
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Cílios e Flagelos
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