PROBLEM
What is the structure of DNA?
SKILLS
Modeling, comparing, analyzing
OBJECTIVE
To construct a model of DNA
Student will construct model of the double helix using construction paper
BACKGROUND INFORMATION
DNA is a molecule that makes up the genes. It looks like a twisting ladder with chains of sugar groups and phosphates connected by pairs of nitrogen bases. Four chemicals make up the chemical contained in each cell they are ADENINE, THYMINE, CYTOSINE, and GUANINE. The letters A, T, C, and G stand for these bases.
MATERIALS
Scissors
Construction paper in white, black, green, red, blue, and yellow
Tracing paper
Tape
PROCEDURE
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1. Trace and cut out 12 white sugar molecules and 21 black phosphate molecules. Label each molecules.
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4. Trace and cut out 12 nitrogen bases: 3 green A’s, 3 red T’s, 3 yellow C’s, and 3 blue g’s. Label each bases.
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5. Construct the two sides of the DNA molecule with the sugars and phosphates.
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6. Complete the molecule of DNA by fitting base pairs along the sides of the molecule.
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7. Tape the DNA molecule together.