Exercício de Reações químicas metabólicas
Exercício:
As reações químicas metabólicas são fortemente dependentes da
temperatura do meio. Como conseqüência, os animais de sangue frio possuem metabolismo
retardado, fazendo com que os mesmos se movimentem muito mais lentamente em climas
frios. Isso os torna mais expostos aos predadores em regiões temperadas do que em regiões
tropicais.
Assinale a alternativa que justifica corretamente esse fenômeno.
A) Um aumento na temperatura aumenta a energia de ativação das reações metabólicas,
aumentando suas velocidades.
B) Um aumento na temperatura aumenta a energia cinética média das moléculas reagentes,
aumentando as velocidades das reações metabólicas.
C) Em temperaturas elevadas, as moléculas se movem mais lentamente, aumentando a
freqüência dos choques e a velocidade das reações metabólicas.
D) Em baixas temperaturas, ocorre o aumento da energia de ativação das reações
metabólicas, aumentando suas velocidades.
E) A freqüência de choques entre as moléculas reagentes independe da temperatura do meio,
e a velocidade da reação independe da energia de ativação.
B) Um aumento na temperatura aumenta a energia cinética média das moléculas reagentes, aumentando as velocidades das reações metabólicas.
O aumento da temperatura faz com que a atividade metabólica aumente, até 40º C, após esta temperatura as proteinas do corpo começam a se desnaturar.
por que a B e não a A?
Nao pode ser A Moriya porque a energia de ativaçao diminui com aumento da temperatura e é justamente por isso que nos tropicos os animais teem sangue quentee.
Alternativa B esta correta
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