DNA 5’ and 3’ Practice Questions
Name:
Biology 5.0
Date:
1. In the diagram to the right, number the carbons in the top
two deoxyribose molecules. (Remember the bases attach
to the 1’ carbon)
2. In the diagram to the right label the ends of each strand as
3’ or 5’.
3. Draw a circle around one nucleotide.
4. How many nucleotides are shown in the diagram to the
right?
5. Write the complimentary DNA strand for the sequences of
bases below.
T
G
C
A
T
6. What type of bond is formed between the nitrogenous bases?
7. What two molecules form the backbone of a DNA molecule?
G
C
8. Why are the two strands of a DNA molecule considered antiparallel?
G
A
C
Use the diagram to answer the remaining questions.
9. Label the phosphate, deoxyribose, and nitrogenous base.
10. Does the nucleotide represent a purine or pyrimidine? Explain.
Period: