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Starter
• I will pass the nucleotides out.
• Cut the nucleotides out (other than the base you don’t have to cut out the lines.
• Create a DNA strand using this sequence:5-ATGCAAGTCCGT-3
Structure
• Double Helix
• Nucleotide Strands– Basic Building Block of DNA– Composed of
• Sugar (Deoxyribose)• Phosphate group• Base (A, T, G or C)
Which bases join together?
• A with T
• C with G
• How are they joined?– Hydrogen Bonds
• These strands are complements! Allowing for DNA replication to take place.
Chromosome numbers• Humans: 46• Aquatic Rat: 92 (tied for most in mammals)• Cat: 38• Chimp: 48• Cotton: 52• Cow: 60• Kangaroo: 12• Adders Tongue: 1200 or 1260• Strawberry: 56
DNA Replication
• The original strands act as parent strands for the replication
• Each receives a new, complementary strand
• Enzymes do all the work
• Produce 2 identical DNA strands
Building of new strands…
• New strand begins to build
• Cannot build it from scratch– Builds on pre-existing strand (parent strand)
• Remember…it will build a Complementary strand– A to T, T to A– G to C, C to G
Two Identical Strands
• When the replication is complete, you are left with two, identical strands of DNA!
Assignment• Read pages 229 – 234
– Ignore pyrimidines and purines– Ignore DNA polymerase– Place a sticky note by something that you
understand and can relate to what we have talked about so far.
– Place a sticky note by something that you don’t understand.
• Answer the concept checks– 11.2 (1-3)– 11.3 (1-3)