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Start-up for 1/8/14

Start-up for 1/8/14. You are going to watch a video titled “What is DNA?” As you watch the video, think about the following questions: What is DNA? Why is it important? What items comprise DNA? http://www.youtube.com/watch?v=zwibgNGe4aY&feature=watch_response. Biology Chapter 12-1 and 12-2

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Start-up for 1/8/14

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  1. Start-up for 1/8/14 You are going to watch a video titled “What is DNA?” As you watch the video, think about the following questions: What is DNA? Why is it important? What items comprise DNA? http://www.youtube.com/watch?v=zwibgNGe4aY&feature=watch_response

  2. Biology Chapter 12-1 and 12-2 DNA and Replication, Pgs. 286-299 Objectives: Students will • Identify DNA and its functions. • List three characteristics of DNA. • Identify the three parts of a DNA nucleotide • Describe DNA’s overall structure • Use Chargaff’s rule to identify base pairs. • Summarize DNA replication

  3. Identify DNA and its functions. What are its functions? What does DNA stand for? • Hereditary Instructions • Chemical code for every trait • “Blueprint” for making Proteins • Deoxyribonucleic Acid

  4. Obj. B) List three characteristics of DNA. What is DNA? 1. Organic molecule – made of carbon 2. Nucleic acid Where is it located? 1. Nucleus 2. Chromosomes X DNA

  5. Obj. C) Identify the three parts of a DNA nucleotide DNA is a nucleic acid. What are the building blocks of nucleic acids? 1. Nucleotides a. Phosphate Group b. Deoxyribose sugar c. Nitrogenous bases: Adenine-Thymine Guanine-Cytosine

  6. Obj. C) Identify the three parts of a DNA nucleotide Given the following combinations, identify those that represent a nucleotide found in DNA. A) Phosphate, Adenine, Deoxyribose B) Deoxyribose, Phosphate, Thymine C) Phosphate, Ribose, Thymine D) Phosphate, Deoxyribose, Guanine E) Phosphate, Deoxyribose, and Uracil A, B, D

  7. Obj. D) Describe DNA’s overall structure Obj. E) Use Chargaff’s rule of base pairing to identify the complementary base in each pair. Nucleotides Ladder Shape 3. Double Helix = Watson and Crick’s Model Sides: Rotate • Sugar • Phosphate Group • Sugar • Phosphate Group Rungs: Attached to sugar • A-T • T-A • G-C • C-G Sugar Phos Sugar Phos Sugar C-G T-A G-C A-T GCAT Hydrogen Bonds

  8. Obj. E) Use Chargaff’s rule of base pairing to identify the complementary base in each pair. Identify the complementary base for each of the following: • 1. Thymine • 2. Cytosine • 3. Guanine • 4. Adenine • 5. Cytosine • 6. Guanine • 7. Thymine • 8. Adenine GCAT • 1. Adenine • 2. Guanine • 3. Cytosine • 4. Thymine • 5. Guanine • 6. Cytosine • 7. Adenine • 8. Thymine

  9. Obj. F) Summarize DNA replication What does it mean to replicate something? COPY • Chromosomes double • When? Mitosis • What stage? Interphase, S Phase • 2n to 4n 2N 2N

  10. Obj. F) Summarize DNA replication Steps for DNA Replication: • DNA untwists • Enzymes unzip DNA • Enzyme – DNA Polymerase creates corresponding base pairs • DNA reforms • 2 strands twist into helix • Result – 2 Identical Strands Each = ½ original, ½ new Identical Strand

  11. Answer the following questions while watching the video: • 1. What two pieces of a nucleotide alternate as the backbone of DNA? • 2. Of what are the DNA rungs comprised? • 3. What is produced from replication? Sugar (Deoxyribose) and Phosphate Group Nitrogen Bases 2 Identical DNA strands Prentice Hall DVD Disc

  12. Understanding Check – Complete the following questions. 1. What is the name of the process where DNA copies itself? 2. Name the three parts of a DNA nucleotide. • Identify the complementary base for each of the following: 4. According to Watson and Crick, what is DNA’s shape? Complete Chapter 12-1 and 12-2 Link Word for homework. You can answer #1-4 and part of #8 on your SBW from your current information.

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