An Introduction to Metabolism Flashcards
What is a metabolic pathway?
a specific molecule is altered in a series of steps, resulting in a product. Each step needs an enzyme
What is a catabolic pathway?
What is an anabolic pathway?
What is free energy?
the portion of a system’s energy that can perform work
What is an exergonic reaction?
net release of free energy
delta G is negative
What is an endergonic reaction?
absorbs free energy
stores energy
delta G is positive
What is ATP? How does it provide energy to do work?
ATP stands for adenosine triphosphate.
Hydrolysis of ATP results in the removal of the third phosphate and the release of energy
How quickly can a muscle cell recycle ATP?
10 million molecules of ATP per second.
WOW!
What is activation energy?
the initial investment of energy for starting a reaction.
What is a substrate?
What do we mean by optimal conditions?
favor the most active shape for the enzyme
What are examples?
What is a cofactor?
What is an example?
What is a coenzyme?
What is a competitive inhibitor?
Binds to active site, competes for the site
examples?
penicillin
Sarin gas
What is a noncompetitive inhibitor?
Do not compete with the substrate to bind to the active site.
But, they cause the enzyme to change its shape in a way that the active site becomes less effective.
What is feedback inhibition?
A metabolic pathway is halted by the inhibitory binding of its end product to an enzyme that acts early in its pathway.
