Permease

... explaination. E . coli already has a number of enzymes that normally use citrate and can digest it . However, it lacks an enzyme called a citrate permease which can transport citrate from outside the cell through the cell’s membrane into its interior. All that was needed therefore to use citrate, ...

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... explaination. E . coli already has a number of enzymes that normally use citrate and can digest it . However, it lacks an enzyme called a citrate permease which can transport citrate from outside the cell through the cell’s membrane into its interior. All that was needed therefore to use citrate, ...

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jonmoulton is right, I missed that posibility. You would have been better off contrasting the Na channel with the Glut permease for example..

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yes, you're on the right track. Glucose uses a system classified as secondary active transport, and fructose uses a permease (does not require ATP)

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... gene, Lac y 3) a gene or Lac a Lac Z encodes for beta-galactosidase that is a lactase: cleaves lactose (the sugar). Lac y encodes for Galactoside permease that promotes the entry of lactose into the cell. lac a encodes for transacetylase, that adds an acetyl group to the lactose molecule making ...

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