Download DNA - The Double Helix

Name ________________________________
DNA - The Double Helix
Part I.
Label the Thymines (T) and color
them orange.
Label the adenines (A) and color
them green.
Label the guanines (G) and color
them purple.
Label the cytosines (C) and color
them yellow.
Color the phosphates blue.
Color the sugars (deoxyribose) red.
Label one hydrogen bond.
Part II. Answer the following questions:
1. Cytosine, guanine, thymine, and adenine are referred to
as __________________ bases.
2. Cytosine is always paired with ________________.
3. Adenine is always paired with _________________.
4. The sides of the DNA molecule are made up of
alternating ______________ and _______________
units.
5. The shape of DNA is a _____________ __________.
6. Which two bases are purines? ____________ and
__________________.
7. Which two bases are pyrimidines?
__________________ and ___________________
8. The bases are held together by __________________
bonds.
9. Write the complementary DNA strand to:
A
G
G
T
C
G
T
C
A
A
T
C
G