They are integrated and controlled pathways of enzyme catalysed reactions in cells.
Reversible steps, irreversable steps and alternative routes
anabolic and catabolic
anabolic reactions build up large molecules from small molecules and require energy.
Catabolic reactiosn break down large molecules into smaller molecules and release energy.
By the prescence or absence of particular enzymes and the regulation of the rate of reaction of key enzymes
Activation energy
transition state
The presence of a substrate or the removal of a product
Competitve, non competitve, feedback
substrate binding
reduces rate of reaction.
reverses competitve inhibition
part of the enzyme other than the active site
the shape of the active site
does not reverse effect
when the end product in the metabolic pathway reaches a critical concentration.
It inhibits an earlier enzyme, blocking the pathway and preventing further synthesis of the end product