1. Aim: What are the compounds important to living things? The physical and chemical properties of water make it unique and necessary for living things Water is necessary for all chemical reactions in living systems.

2. Water's Chemical Properties Polar molecule sticky universal solvent pH of 7pH

3. Water's Physical Properties found in all three states of matter -- liquid, solid (ice), and gas (steam)

4. Water’s Physical Properties water's freezing point is 0 degrees on the Celsius scale water's boiling point is100 degrees Celsius high specific heat index

5. Physical Property of water high surface tension

6. Other important inorganic compounds found in living things include salt body fluids contain salt Halite

7. The Chemical Evolution occurred in H 2 O The molecules we know today are descended from the first molecules that formed life on Earth. Earth’s Primordial Environment  Present atmosphere  First Molecules formed in organic soup

8. RNA was the first organic molecule to appear in the organic soup (ocean) of modern Earth Read the article – take notes share with your group

9. RNA is a polymer made up of four repeating subunits called nucleotides. Each nucleotide contains a sugar, a phosphate group and a nitrogenous base. Aim: What is RNA?

10. Nucleotides in RNA are made up of a sugar, phosphate and base

11. The sugar in the nucleotide that makes up RNA is ribose

12. Types of RNA mRNA - carries a message tRNA – carries a code from the mRNA rRNA – structural RNA that makes up a ribosome

13. HW 6 Make templates of the structures on the sheet with the Parts of RNA nucleotides Ribose + phosphoric acid – yellow Uracil – blue Cytosine – black Adenine – red Guanine – green Cut out the pieces (4 ribose-phosphoric acid) and one of each of the others.