Building a DNA Molecule
Name:
Biology 5.0
Date:
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Period:
Each person must create a single strand of DNA with 4 NUCLEOTIDES.
Each nucleotide must contain a phosphate group, a deoxyribose sugar, and a base.
The partner must create a complimentary strand of DNA. 3 points
The two strands must be antiparallel (3’ – 5’ and 5’ - 3’). 2 points
Only complimentary bases will interlock and fit together. 2 points
Deoxyribose sugar and phosphate make up the backbone (sides of the ladder) of the DNA molecule. 2
points
 Phosphates connect to the 3’ and 5’ carbons of deoxyribose. One nucleotide has the phosphate group
attached to the 5’ carbon. 2 points
 The bases are found in the center of the DNA molecule. 2 points
 The bases are connected to the 1’ carbon in deoxyribose sugar in the backbone. 2 points
Model Total =
/15 points
1. What do the letters DNA stand for?
2. Where would this model be located in eukaryotic cells?
3. What did the scientists call the shape of this molecule?
4. What scientists built the first 3-dimensional model of DNA?
5. What 2 chemicals make up the sides of the ladder?
6. What chemicals form the steps (rungs) of the ladder?
7. What bond holds the bases together?
8. What three parts of the model make up a nucleotide?
9. What is the base pairing rule?
10. What does it mean when DNA is said to have “antiparallel strands”?
Questions:
TOTAL =
/ 10 points
/25 points
Deoxyribose Sugar
Phosphate
Group
Nitrogenous Bases