What you should learn The difference between Anabolic and Catabolic metabolic pathways and give examples of each The importance of reversible irreversible and alternative pathways in the control of metabolism ID: 631761
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Slide1
Cell Metabolism
Metabolic PathwaysSlide2
What you should learn:-
The difference between
Anabolic and Catabolic metabolic pathways, and give examples of each.The importance of reversible, irreversible and alternative pathways in the control of metabolism.The key role played by specific enzymes in regulating rates of reactions.
Metabolic PathwaysSlide3
Cell Metabolism is defined as :-
The product of
all the biochemical reactions which take place in a living cell.Cell metabolism involves a network of interconnected and integrated chemical pathways catalysed by enzymes.Link to youtube lesson on metabolism http://www.youtube.com/watch?v=iIW5SPY-vwI
Metabolic PathwaysSlide4
Metabolic pathways fall into two categories:-
Catabolic
pathways lead to the breakdown of complex molecules into simpler ones, usually with the release of energy. E.g aerobic respiration.Anabolic pathways lead to the (bio)synthesis of more complex molecules from simpler ones (building blocks) – requires energy.
E.g. protein synthesis
Metabolic PathwaysSlide5
The two types of metabolic pathway
Respiration
Protein Synthesis Catabolic Anabolic
Glucose
+
Oxygen
Carbon Dioxide
+
Water
Energy
Energy
ATP
ADP
+
Pi
e.g. Amino Acids
Protein molecule
Energy
Energy
Catabolic – Aerobic Respiration
ENERGY TRANSFER
Anabolic – e.g. Protein synthesisSlide6
Synthetic (anabolic) reactions
Another example:
glucose-1-phosphate phosphorylase starchThis reaction requires the input of energy to proceed (anabolic reaction). Slide7
Breakdown (catabolic) reactions
Another example:
starch amylase maltoseThis reaction releases energy (catabolic reaction).Slide8
What else do you need to know?
Metabolic pathways can have
reversible and irreversible steps. ANDAlternative pathways may exist that can bypass steps in a pathway.Slide9
Example of reversible/ irreversible pathwaysSlide10
Example of alternative routes in metabolism