1. Eagle Zone-write the question 1. The cytoplasm is divided in which phase of the cell cycle? 2. Provide the phases of mitosis? 3. What is the purpose of the cell cycle?

2. How does our body replace old cells? More Than Skin Deep Cell Cycle

3. TAKS TAKS Objective 2 – The student will demonstrate an understanding of living systems and the environment. TAKS Objective 2 – The student will demonstrate an understanding of living systems and the environment.

4. TEKS The student knows the structures and functions of nucleic acids in the mechanisms of genetics. The student is expected to The student knows the structures and functions of nucleic acids in the mechanisms of genetics. The student is expected to (A) describe components of deoxyribonucleic acid (DNA); and illustrate how information fro specifying traits of an organism is carried in the DNA; (B) explain replication, transcription, and translation using models of DNA and ribonucleic acid

5. Engage Snakes shed their entire epidermis 4-8 times per year. Snakes shed their entire epidermis 4-8 times per year. Snakes Humans shed their entire epidermis every 15 to 30 days. Humans shed their entire epidermis every 15 to 30 days. Humans –What factors cause your epidermis (skin) to shed that often? How do Bloodhounds detect a person’s scent when tracking? How do Bloodhounds detect a person’s scent when tracking?

6. Explore 1: Cell Cycle Research Never Ending Cycle online activity Never Ending Cycle online activity Student will complete a cell cycle diagram with detailed description of cellular activity in each of the cell cycle phases. Student will complete a cell cycle diagram with detailed description of cellular activity in each of the cell cycle phases.

7. Cell Cycle

8. Explain: Cell Cycle All cells constantly replace themselves by a process called mitosis, which is a small section of the cell cycle. All cells constantly replace themselves by a process called mitosis, which is a small section of the cell cycle. New skin cells push the older generation of cells toward the surface of the skin, where they are finally shed as a flake-like, lifeless, residue New skin cells push the older generation of cells toward the surface of the skin, where they are finally shed as a flake-like, lifeless, residue

9. includes is divided into What are the two main phases of the cell cycle? Cell Cycle M phase (Mitosis) Interphase G 1 phaseS phaseProphaseG 2 phaseMetaphaseTelophaseAnaphase

10. Eagle Zone Review for quiz using the online game or your notes from last class

11. Quiz - write in complete sentences 1. What are the two main phases of the cell cycle? 2. Explain what happens during the Synthesis phase of the cell cycle. 3. How many new cells are produced at the conclusion of the cell cycle? 4. What is the main difference between Mitosis and cytokinesis (what is dividing)? 5. Why is the cell cycle important? (what is its purpose?)

12. The Cell Cycle? Cell cycle – the changes a cell goes through during its life span. contains 2 main steps. 1.Interphase (LONGEST phase of the cell cycle and has three parts) G1 (growth-Everyday Cellular Activity) S (DNA Synthesis) G2 (growth-Other Organelles Replicated) 2. M-Phase or Mitotic Phase (Shortest phase) Mitosis (Division of nucleus) Cytokinesis (Cytoplasm Division)

13. Explore 2: S Phase Berry Full of DNA Lab

14. Exploration 2 Strawberry DNA Lab

15. Review: Interphase (G1) What is the main purpose of a cell that is in G1? G 1 Phase: During this stage the cell is carrying on its everyday activities. If the cell’s surface to volume ratio gets too big then the cell must get ready to divide. Do some cells entering a resting state? What is this phase called? G 0 Phase: Resting State - Some cells leave the cell cycle and stay here much longer than others ex) brain, nerve, etc…

16. Exploration 3 DNA Jewelry

17. Instructions For A Human Being

18. AdenineGuanine CytosineThymine Phosphate group Deoxyribose Explain: DNA Section 12-1 Nucleotides

19. Hydrogen bonds Nucleotide Sugar-phosphate backbone Key Adenine (A) Thymine (T) Cytosine (C) Guanine (G) Structure of DNA Section 12-1

20. DNA Deoxyribose Sugar Base Pairs A-T G-C Phosphate

21. Getting The Letters Out

22. What is a DNA Nucleotide? The basic building block of nucleic acids containing a sugar, base, and a phosphate. P B S S = Deoxyribose Sugar B = Adenine, Guanine, Cytosine, Thymine P = Phosphate

23. Sugar

24. Phosphate

25. Bases (Nitrogenous Bases) These chemicals are often called nitrogenous bases because of the high content of nitrogen (N) atoms

26. Nucleotide The Sugar and the Phosphate make up the backbone of the structure The bases make up the rungs of the ladder

27. Different Types of Nucleotides in DNA Deoxy --- Adenine | P Deoxy ---- Thymine | P Deoxy --- Cytosine | P Deoxy ---- Guanine | P

28. Many Nucleotides Together

29. Parts of DNA Has a Sugar/Phosphate Backbone Bases make up the steps of the ladder A-T G-C

30. DNA Structure

31. Replication Practice On your paper, complete the missing DNA strand by adding the complementary bases. A T C G T T G C C A T C T A G C A A C G G T A G

32. DNA Replication

33. DNA Replication A Closer Look » DNA before replication: 1 double helix » » » » DNA after replication: 2 identical double helixes »

34. DNA Replication Section 12-2 Growth Replication fork DNA polymerase New strand Original strand DNA polymerase Nitrogenous bases Replication fork Original strand New strand

35. Getting Ready

36. Step 1 Unwinding and Unzipping

37. Unwind and Unzip Helicase Enzyme

38. Step 2 Separates Polymerase Enzyme

39. Step 3 Picking up Complementary Bases

40. Separation and Adding Bases 5’----3’

41. Step 4 Rewind

42. Two New DNA Molecules Each DNA Molecule with a Parent and Daughter Strand

43. DNA Replication Video http://highered.mcgraw- hill.com/olcweb/cgi/pluginpop.cgi?it=swf:: 535::535::/sites/dl/free/0072437316/120076 /micro04.swf::DNA%20Replication%20For khttp://highered.mcgraw- hill.com/olcweb/cgi/pluginpop.cgi?it=swf:: 535::535::/sites/dl/free/0072437316/120076 /micro04.swf::DNA%20Replication%20For k

44. Interphase (G2) G 2 phase: The rest of the cell’s organelles are reproduced.

45. Elaborate: Photo 51 Scientific contributions to the discovery of the DNA structure.