Dictionary » P » Permease

Permease

permease

(Science: enzyme) general term for a membrane protein that increases the permeability of the plasma membrane to a particular molecule, by a process not requiring metabolic energy.

See: facilitated diffusion. A type of [[protein believed to be involved in [[active transport and acts as a [[protein carrier.


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Re:

... 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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by robsabba
Mon Jun 21, 2010 4:25 pm
 
Forum: Evolution
Topic: Experimental evidence for evolution
Replies: 103
Views: 177628

Experimental evidence for evolution

... 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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by jevg
Mon Jun 21, 2010 4:13 pm
 
Forum: Evolution
Topic: Experimental evidence for evolution
Replies: 103
Views: 177628

Got a Biology Test back, had a question

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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by MrMistery
Mon Dec 15, 2008 4:44 pm
 
Forum: Cell Biology
Topic: Got a Biology Test back, had a question
Replies: 4
Views: 2936

Please help...I'm completely confused????

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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by MrMistery
Tue Oct 21, 2008 8:47 pm
 
Forum: Cell Biology
Topic: Please help...I'm completely confused????
Replies: 3
Views: 1540

Re: help with report on Plasmid Properties

... 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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by Biologista
Fri Oct 26, 2007 6:19 pm
 
Forum: Molecular Biology
Topic: Re: help with report on Plasmid Properties
Replies: 4
Views: 3376
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