DNA chapter 12 A. What is DNA? 1. The nucleic acid that stores - PowerPoint PPT Presentation

DNA – chapter 12 A. What is DNA? 1. The nucleic acid that stores and transmits the genetic information from one generation to the next.

B. What is the structure of DNA? 1. 4 nucleotides (phosphate, sugar, base) a. thymine b. cytosine c. adenine d. guanine 2. double helix a. sugar-phosphate backbone 1) sugar bonds to phosphate 3. Hydrogen bonds b/w complementary bases

a. complementary: adenine – thymine guanine - cytosine

Chromosomes and DNA Replication (chapter 12.2) A. DNA Replication: Nucleus ONLY! 1. Purpose: copy DNA when cell divides  make a copy of chromosomes for new cell 2. Challenging due to: a) length of DNA b) number of base pairs to correctly copy

3. Process: pg. 297-299 a. parent DNA is separated by enzymes (DNA helic ase ) b. free nucleotides floating around nucleus bond to the parent strand (DNA polymer ase )  new replicated strand (DNA Lig ase )

2. Replicate the DNA strand: A T G C T C C G T T A C G T A A C G

2. Replicate the DNA strand: A T G C T C C G T T A C G T A A C G T A C G A G G C A A T G C A T T G C