Warm Up: Warm Up: Take out homework. What is the shape of DNA? Where is DNA found in cells? What is the monomer (building block) of nucleic acids (macromolecule)?

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Presentation transcript:

Warm Up: Warm Up: Take out homework. What is the shape of DNA? Where is DNA found in cells? What is the monomer (building block) of nucleic acids (macromolecule)? Homework:Homework: Complete DNA completion worksheet (only side 1)

The 5-carbon sugar may be different in other nucleic acids. The sugar in DNA is deoxyribose.

3 PARTS: 1.Sugar Molecule – deoxyribose 2.Phosphate Group – phosphorous(P) and oxygen (O) 3.Nitrogen Base – adenine(A), cytosine(C), guanine(G), and thymine(T)

One strand can be a “template” to find the code of the other, but they are NOT identical –Which bases are complements? –Chargaff’s Rules of Base Pairing

“Sugar- phosphate backbone” The phosphate of one nucleotide is bonded to the sugar of the next.  HYDROGEN BONDS!!!

Draw the complementary strand of the following DNA template.

A Twisted Ladder Complementary strands are held together by hydrogen bonds

Write a caption (paragraph) to describe the molecule to the left. Include as much information as possible.

Write answers on whiteboards: 1.Draw and label the monomer of a Nucleic Acid. 2.What makes each nucleotide different? Name the 4 nucleotides. 3.Identify the complementary base pairs 4.What is the “bond” that holds the complementary DNA strands together? 5.What molecules make up the “backbone” of DNA?

Brain Pop!!

Honors should have also described the following: 6.The difference between purines and pyrimidines 7.How DNA is antiparallel

Build a model of DNA Make 9 base pairs!!!Make 9 base pairs!!! Blue tubes = cytosine Yellow tubes = guanine Green tubes = thymine Orange tubes = adenine White tubes = phosphates White rods = hydrogen bonds Purple or black pentagons = deoxyribose (sugar)