Flashcards in Cell Metabolism Deck (16):
What is cell metabolism?
The collective name for the thousands of biochemical reactions that take place within a living cell.
All chemical reactions in the cells
All the build-up/synthesis reactions. BIOSYNTHESIS. Amino acids joining to form a protein.
All the breakdown reactions. Oxidation of glucose in respiration to produce water and CO2.
What is induced fit?
The active site of an enzyme will change its shape slightly to allow the substrate to fit.
What are 4 factors that affect enzyme action?
The presence of enzyme inhibitors
What is the active site?
The place on an enzyme where the substrate acts on.
What are multi-enzyme complexes?
Enzymes that act in groups- DNA polymerase and RNA polymerase.
What is the advantage of a cell being able to switch off the gene which codes for enzymes?
To prevent resources being wasted.
How can enzymes that are continuously produced be controlled?
Using signalling molecules or by the presence of inhibitors.
What is an intracellular signal molecule?
Signal molecules produced by a cell to control its own metabolism.
What is an extracellular signal molecule?
signal molecules that come from the cell's environment. Adrenaline.
What are competitive inhibitors?
Bind directly to the active site and prevent substrate molecules from binding and reacting.
What are non-competitive inhibitors?
Bind elsewhere on the enzyme molecule but permanently alter the shape of the active site preventing the substrate to bind properly.
What is end product inhibition?
Some of the end product binds to enzyme ! and inhibits it. This slows down the conversion and so regulates the whole pathway. When the end product of used up, enzyme 1 becomes more active and pathway speeds up to produce more end product.