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Lecture 4

BIOL 112 Winter 2013 Lecture 4 - Part 2.docx

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McGill University
Biology (Sci)
BIOL 112
Frieder Schoeck

HBM Main Function of RNA: intermediate between DNA and protein (mRNA)  Some may have complex 3D structure o Stem-loop structures  May also be catalytic (riboenzymes)  Function of DNA and proteins may have been carried out by RNAs when life evolved o Unique folding pattern, which gives different properties for the RNA 1. Ribose, bases, and phosphate come together to form RNA 2. Some RNA molecules gain the ability to replicate 3. RNA molecules begin to make catalytic proteins 4. Catalytic proteins increase the efficiency of RNA replication and protein synthesis. They also aid the formation of double stranded RNA, which then evolves into double-stranded DNA 5. DNA becomes the primary molecule for information storage. DNA uses RNA to make proteins, which in turn help with DNA replication and transcription. HBM Lipids  Hydrophobic – insoluble in water o Results from the many nonpolar covalent bonds of hydrogen and carbon in lipids.  Aggregate away from water (which is polar)  Attracted to other lipids through weak van der Waals forces.  Roles of lipids in organisms in
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