Download DNA Model Lab

Name _______________________________________
Date _______________
Period _____________
Lab # ______ - DNA Model Lab
DNA is the genetic material that organisms inherit from their parent(s). This molecular reproduction is
the basis for the continuity of life. A DNA molecule is very long and consists of hundreds of thousands of
genes. A gene’s meaning to the cell is encoded in its specific sequence of four nitrogenous bases. These
bases are:




Adenine
Thymine
Cytosine
Guanine
Each DNA molecule is made up of repeating units called nucleotides. Each nucleotide consists of a
phosphate bonded to a 5-carbon sugar and a nitrogenous base.
Pre-lab Questions:
1. Draw a nucleotide, identifying the three parts:
2. What bases pair together according to the rules of base pairing? Write out the full names.
Procedure
1. Cut out the DNA components on the following pages (Deoxyribose sugar, Phosphate and Nitrogenous
Bases).
2. Color the components accordingly:
Component
Color
Deoxyribose sugar
Orange
Phosphate
Green
Adenine
Red
Thymine
Yellow
Cytosine
Blue
Guanine
Purple
Match up the symbols (
▪, ● and *) to correctly assemble a long chain (8 base pairs) of DNA.
Conclusion Questions (answer all questions in complete sentences)
1. Compare your chain with that of your neighbor. What do you notice?
2. Identify two types of nucleic acids.
3. Which type of nucleic acid did you create today?
4. What are the differences between RNA and DNA?
5. Explain the following statement: Everyone’s DNA is made of the same four nitrogenous bases. Everyone’s DNA
is distinct (this is why it can be used as forensic evidence).