Department of Energy Argonne National Laboratory Office of Science NEWTON's Homepage NEWTON's Homepage
NEWTON, Ask A Scientist!
NEWTON Home Page NEWTON Teachers Visit Our Archives Ask A Question How To Ask A Question Question of the Week Our Expert Scientists Volunteer at NEWTON! Frequently Asked Questions Referencing NEWTON About NEWTON About Ask A Scientist Education At Argonne Enzyme Reversibility
Name: Lisa
Status: Student
Grade:  9-12
Location: NY
Country: United States
Date: January 2005


Question:
How is the reversibility of an enzyme controlled? What determines whether it will make a product or dismantle it?



Replies:
The enzyme does not affect the equilibrium of the reaction, that is, the ratio of substrate to product. If an enzyme is added to a solution of S it will produce P until the equilibrium ratio of S/P is attained. If enzyme is added to a solution of P, it will produce S until the same equilibrium ratio is attained . At equilibrium, the rate of formation of P from S is the same as the rate of formation of S from P in terms of moles/unit time. In short, the direction that the enzyme catalyzes depends on how far away from equilibrium the reaction is.

Ron Baker, Ph.D.



Click here to return to the Molecular Biology Archives

NEWTON is an electronic community for Science, Math, and Computer Science K-12 Educators, sponsored and operated by Argonne National Laboratory's Educational Programs, Andrew Skipor, Ph.D., Head of Educational Programs.

For assistance with NEWTON contact a System Operator (help@newton.dep.anl.gov), or at Argonne's Educational Programs

NEWTON AND ASK A SCIENTIST
Educational Programs
Building 360
9700 S. Cass Ave.
Argonne, Illinois
60439-4845, USA
Update: June 2012
Weclome To Newton

Argonne National Laboratory