U1 K6 Flashcards
What are metabolic pathways?
Integrates + controlled pathways of enzyme-catalysed reactions within a cell.
What are the types of metabolic pathways?
Anabolic & Catabolic
What is anabolic ?
Build up of large molecules from small molecules ( requires ATP)
What’s catabolic?
Breakdown of large molecules into small molecules. (Releases energy, to generate ATP.)
What is a chemicals reaction activation energy?
The energy required to break chemical bonds.this is reduced only enzymes.
Give 3 functions of catalysts
Speed up chemical reactions.
Remain unchanged+ can be reused.
Lowers activation energy.
What is an Inhibitor?
A molecule that reduces or stops enzyme activity.
How does a competitive inhibitor work?
Binds at the active site preventing the substrate from binding,
Can be reversed by increasing enzyme substrate concentration.
Describe how a non -competitive inhibitor works?
Binds AWAY from the active but changes shape of the active site preventing substrate from binding.
What controls metabolic pathways?
Competitive , non competitive and feedback inhibition of enzymes.
Explain end -product inhibition
When the end product reaches critical concentration, this then inhibits an earlier enzyme, blocking the pathway, preventing further synthesis of the end-product.
Benefit of end-product inhibition.
Conserves ATP in a cell.
Another name for feedback inhibition?
Negative feedback control
