DNA Structure and Replication Practice
Use your DNA notes to answer these questions.
1. DNA is made up of many repeating single units (​monomers​). What are the monomers
called?
2. The “backbone” (sides of the ladder) of the DNA molecule is made up of two alternating
components, what are these?
3. The rungs of the ladder are nitrogenous bases. _______________________ pairs with
_______________________ and the base _______________________ pairs
with _______________________.
This is called c
​ omplementary base pairing​. One strand of DNA is complementary to
the other strand (opposite/matching).
4. Write the complementary sequence to the following DNA strand:
G
T
A
A
G
C
G
C
A
A
T
T
A
C
5. Color the DNA structure to the right:
Step 1:
● C​olor each deoxyribose sugar (D) red
●
Color each phosphate group (P) blue
Step 2:
Step 3: Look at the diagram below, then
●
●
Color the _____ hydrogen bonds between A and T
black
Leave the ____ hydrogen bonds between G and C
white
Note: There are shapes on the diagram so you can fill
them in digitally. For hydrogen bonds digitally, you can
add lines.
6. Use the image at the right to complete the follow:
●
●
●
Circle (or draw a box around) a nucleotide.
Label the sugar and phosphate (A and B).
Label the bases that are not already labeled.
Note: there are text boxes for the bases if
you are doing this digitally
7.​ ​ ​Below is part of a template strand of DNA.
a. Complete the rest of the template using Chargaff’s Rule (like in 4. above).
A
T
G
G
T
A
G
C
T
A
A
C
b. This DNA strand splits into two and begins to replicate. When DNA replicates, two
___________________molecules are formed each containing a template strand and a ______
synthesized strand. Create the two new DNA strands below.
DNA Strand 1
A
T
DNA Strand 2
G
G
T
A
G
C
T
A
A
C
8. Complete this ​Edpuzzle assignment on DNA replication.