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class="post-498 post type-post status-publish format-standard has-post-thumbnail hentry category-explicacoes category-quimica category-resumos tag-atomos tag-compostas tag-hidrogenio tag-liquido tag-materias tag-oxigenio tag-particulas tag-simples tag-substancias">

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Substâncias Simples e Compostas

Química

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Qualquer tipo de matéria é sempre formada por partículas minúsculas chamadas átomos. Atualmente são conhecidos 111 tipos de átomos, quimicamente diferentes. Cada um desse tipo representa um elemento químico, o qual recebe um nome e uma abreviação chamada símbolo. Exemplo: Elemento: Hidrogênio símbolo: H Carbono símbolo: C Esses tipos de átomos diferentes podem se agrupar das mais variadas maneiras possíveis formando uma infinidade de moléculas diferentes. Cada molécula passa então a representar um substância pura ou espéciequímica. Cada substância é representada por uma abreviação denominada fórmula. Assim: H² = Gás Hidrogênio I. Substâncias Simples: As substâncias simples são moléculas formadas por átomos de um mesmo elemento químico. exemplo: Devemos observar porém que há átomos…

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Explicações, Química, Resumos
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, , , , , , , ,
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class="post-407 post type-post status-publish format-standard has-post-thumbnail hentry category-biologia category-explicacoes category-resumos tag-dna tag-francis-crick tag-hidrogenio tag-james-watson tag-nucleotideos">

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Ácido desoxirribonucleico (DNA)

Biologia

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De acordo com o modelo proposto por James Watson e Francis Crick, em 1953, para o DNA (que lhes valeu o prêmio Nobel de Fisiologia e Medicina de 1962), a molécula é constituída por dois filamentos (cadeias de nucleotídeos) enrolados, um ao redor do outro, na forma de uma hélice dupla. Os nucleotídeos de um mesmo filamento ficam unidos por uma ligação que se estabelece entre a pentose de um nucleotídeo e o fosfato donucleotídeo vizinho. E os filamentos, também chamados de fitas, estão ligados por meio de pontes de hidrogênio situadas entre uma base púrica e uma base pirimídica. No DNA, a base púrica adenina A) liga-se sempre à…

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Biologia, Explicações, Resumos
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, , , ,
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