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All about DNA Structure, Building Blocks, and Replication.

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Presentation on theme: "All about DNA Structure, Building Blocks, and Replication."— Presentation transcript:

1 All about DNA Structure, Building Blocks, and Replication

2 DNA Structure-Review REVIEW!REVIEW! Which type of organic molecule is DNA?Which type of organic molecule is DNA? NUCLEIC ACID!!NUCLEIC ACID!! DNA stands for DEOXYRIBONUCLEIC ACIDDNA stands for DEOXYRIBONUCLEIC ACID Building Blocks of Nucleic Acids =Building Blocks of Nucleic Acids = NUCLEOTIDESNUCLEOTIDES Or subunitsOr subunits

3 DNA Structure- Nucleotides Each nucleotide is made of 3 parts: 1. S ugar (Deoxyribose) 2. P hosphate 3. 1 of 4 Nitrogenous Bases: A = adenine T = thymine C = cytosine G = guanine 4.S o which part of a nucleotide changes?? THE NITROGEN BASE!!!!! 5.S o how many different nucleotides are there for DNA? Four (4)

4 Label a nucleotide!

5 DNA Shape and Form DNA IS DOUBLE STRANDEDDNA IS DOUBLE STRANDED STRANDS TWIST TO FORM DOUBLE- HELIXSTRANDS TWIST TO FORM DOUBLE- HELIX NITROGEN BASES BIND TOGETHER TO MAKE TWO STRANDSNITROGEN BASES BIND TOGETHER TO MAKE TWO STRANDS A always binds with TA always binds with T C always binds with GC always binds with G ****THIS IS CALLED THE BASE-PAIR RULE!**** Now, on your notesheet, fill in the COMPLEMENTARY strand using the BASE-PAIR rule!Now, on your notesheet, fill in the COMPLEMENTARY strand using the BASE-PAIR rule!

6 Answer to Notesheet Practice

7 DNA Structure Let’s Practice Again!Let’s Practice Again! One strand of DNA has the sequence you see. What is the complimentary strand’s sequence???One strand of DNA has the sequence you see. What is the complimentary strand’s sequence??? G G T A C G C C T-----C-----C -----A -----T -----G -----C -----G -----G -----A

8 Replication: The Video Clip http://www.youtube.com/watch?v=z685FF qmrpo http://www.youtube.com/watch?v=z685FF qmrpo

9 DNA Replication (Copying) CLICK HERE FOR DEMO CLICK HERE FOR DEMO When does DNA need to be copied????When does DNA need to be copied???? BEFORE any CELL DIVISION!BEFORE any CELL DIVISION! DNA acts as a PATTERN or TEMPLATE to make copies of itself!DNA acts as a PATTERN or TEMPLATE to make copies of itself! Steps of DNA Replication:Steps of DNA Replication: First, two (2) strands are “unzipped” by enzymesFirst, two (2) strands are “unzipped” by enzymes Second, other enzymes bring new subunits (nucleotides) to these separated strandsSecond, other enzymes bring new subunits (nucleotides) to these separated strands Each strand acts as a template to build a new DNA moleculeEach strand acts as a template to build a new DNA molecule Third, you end up with 2 NEW identical double helicesThird, you end up with 2 NEW identical double helices CLICK HERE FOR DEMO #2 CLICK HERE FOR DEMO #2

10 DNA Replication Diagram Free Floating Nucleotides Parent Strands New complimentary strands

11 Replication Practice- Step 1 “Unzip” GG T A C G C C T-----C-----C -----A -----T -----G -----C -----G -----G -----A Enzymes UNZIPGG T A C G C C TCC A T G C G G A

12 Replication Practice- Step 2 Add Subunits using Base-Pair Rule GG T A C G C C TCC A T G C G G A----C----C ----A ----T ----G ----C ----G ----G ----AG----G---- T---- A---- C---- G---- C---- C---- T----

13 THE DNA RAP!!!! http://www.youtube.com/watch?v=d1UP f7lXeO8http://www.youtube.com/watch?v=d1UP f7lXeO8http://www.youtube.com/watch?v=d1UP f7lXeO8http://www.youtube.com/watch?v=d1UP f7lXeO8


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