This document discusses nitrogenous bases that make up DNA, including adenine, thymine, guanine and cytosine. It provides a nitrogenous base sequence and instructions for students to write the complementary bases in boxes diagonally across to create a DNA double helix model, color the bases, and fold the model.

1. Nitrogenous
Bases

2. Adenine

3. Thymine

4. Guanine

5. Cytosine

7. Nitrogenous Base Sequence
G
A
T
T
A
C
A
T
G
G
C

8. Nitrogenous Base Sequence
1. Write the complementary base in boxes diagonally across
from the given sequence.
2. Fill the top box with the complementary base from the
bottom.
3. Color the bases according to the code.
4. Fold your DNA model!