KA6 Matabolic Pathways Flashcards
When does a feedback inhibitor occur
When the end product reaches a critical concentration
What is a catabolic reaction
The breakdown of large molecules into small
ones and release energy
Eg the series of reactions in aerobic respiration
What is a anabolic reaction
The build up it synthesis large molecule from small ones and require energy
Eg protein synthesis
What is the summary of metabolic pathways
- Metabolic pathways consist of several stages involving the concentration of one metabolite to another
- Each step is controlled by particular enzyme
- Each enzyme is coded by a particular gene
- if the right enzyme is present the pathway will go ahead of the right enzyme is absent the pathway will halt
What is a metabolic pathway
A series of enzymed-catalysed reactions, the control of which is essential for cell survival
What is a metabolism
Name given to all the biochemical reactions
It is the network connected and inter-grated pathways involved with cell activities
What is a reversible pathway
When a molecule can be converted back into the form it started in
What is a irreversible pathway
Meaning the molecule is permanently changed
Why might a metabolic block occur
Due to gene mutation resulting in the absence of a functional enzyme
What do catalysts do
Speed up chemical reactions
What is the starting molecule called
Substrate
What is a optimum conditions
Conditions that allow enzymes to work at their highest rate
Eg temperature and PH
What is the active site
Site where an enzyme binds with its substrate
What are two types of chemical reactions
Synthesis -build up
Degradation- breakdown
What are factors which might affect the rate of enzyme activity
Temperature
PH
Substrate concentration
Product concentration
