Bio 10 heterotróficos
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Obtenção de matéria pelos seres heterotróficos
https://sites.google.com/site/geologiaebiologiacorreia1966/
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6Que estratégias utilizam os seres
vivos para obter matéria e energia?
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As células são delimitadas pela membrana plasmática
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Biomoléculas da membrana
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Evolução dos modelos da estrutura da membrana
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16Na membrana celular há movimento de fosfolípidos
e de proteínas.
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A membrana é seletivamente permeável
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O transporte de substâncias através das
membranas plasmáticas depende da :
Dimensão
Carga elétrica do composto.
Solubilidade do composto (depende em
larga medida da carga elétrica e do
tamanho).
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Transporte de material através da membrana plasmática
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Transporte não mediado
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Entrada e saída de água dos vacúolos
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22Solução hipertónica – meio cujo número de moléculas em
solução é superior ao de outro meio qualificado como
hipertónico.
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A membrana plasmática é permeável à água
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This is SO easy any one can do it! Fill water
ONLY in the outer two containers....add food
coloring to the water....fold a paper towel
and put in each container and have them
meet in the empty middle container....leave
it alone...a few hours later you will be
amazed to see how water and the food
coloring particles reach perfect equilibrium!
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26Os rápidos movimentos de água implicam a existência de
canais proteicos específicos para o seu transporte –
aquaporinas.
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Transporte mediado
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Exocitose e endocitose
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