BIOL 1020 Study Guide - Midterm Guide: Nucleolus, Photosynth, Photoexcitation

• School: University of Manitoba
• Department: Biological Sciences
• Course: BIOL 1020
• Professor: Joy E.Stacey

Document Summary

All molecules formed in between substrate and end product are called intermediates". Not linearly independent from other catabolic pathways. Once a large molecule broken down into small parts, those small parts can be used to build molecules in another metabolic pathway. Figure: crossed lines, different connections between metabolic pathway. How are pathways regulated: feedback inhibition. Cell shutting off a pathway that is not needed: prevent waste of chemical resources. For instance : cell not dividing, does not need phospholipid, can use atp for another process in the cell. How: the presence of excess of intermediate product shuts off the pathway that produces it, product/intermediate binds to enzyme in the pathway that produced it, this is called allosteric inhibition" or non-competitive inhibition". Bind to other side change in shape prevent enzyme from accepting that substrate. Enzyme pathway: threonine: end product isoleucine, not being used begins to build up, concentration rise in cell, binds to site on first enzyme.