What chemicals are in DNA Sugar deoxyribose Phosphate

What chemicals are in DNA? • Sugar = deoxyribose • Phosphate • Nitrogen bases • Which Nitrogen bases pair? • A–T • C-G = nucleotide

Review In the diagram below, strands I and II represent portions of a DNA molecule. What would strand II normally include? (a) AGC (b) TCG (c) TAC (d) GAT

• The backbone of a DNA molecule is made of which two components? • (a) phosphate molecules and ribose sugars • (b) deoxyphosphate molecules and ribose sugars • (c) phosphate molecules and deoxyribose sugars • (d) deoxyphosphate molecules and deoxyribose sugars

Add to table of contents: Creating DNA Vocabulary Replication model DNA Replication Pg. 34 Pg. 35 Pg. 36 Pg. 37

What do these have in common? They all contain the same chemicals in their DNA!

The diagram below represents a portion of a nucleic acid molecule. The part indicated by arrow X could be (a) adenine. (b) ribose. (c) deoxyribose. (d) phosphate.

DNA REPLICATION Pg. 37 • Chromosomes are duplicated Interphase during _____. • Replication- DNA molecule making copies of itself

1) Double helix untwists. Replication 2) H bonds are broken by DNA helicase and the DNA separates like a zipper. (Each ½ serves as a pattern for the new DNA chain. ) 3) DNA polymerase connects free nucleotides in the nucleus to the correct bases. (BASE PAIRING RULE using Primase) Steps of

Steps, cont. 4) Bonds form between all the parts. (Ligase) 5) 2 new DNAs twist into the double helix. Untwist unzipping adding new parts 2 DNA molecules retwist

Answer your Essential Question

DNA RECOMBINATION • Notice A always joins to T and G always to C

Assignment: 1. Color DNA nucleotides: S = yellow P = purple T = green C = orange A = red G = Blue 2. Cut them out. 3. Create a DNA molecule for the nucleotide sequence I give you. 4. When done turn into the basket and clean up your desk area, floor area and bucket.