DNA Structure and Replication Quiz
Name_______________________
Per____Date________________
Use the diagram of a DNA molecule to answer the following questions. Use the letters to identify
structures.
_______________ 1. What represents a phosphate?
_______________ 2. Which structure represents a base?
_______________ 3. Which structure is the 5 carbon sugar?
_______________ 4. Where is the hydrogen bond formed?
_______________ 5. Which structure represents the nitrogen base?
_______________ 6. Which structure(s) make up the backbone or uprights (sides) of the DNA
molecule?
_______________ 7. Which structure(s) make up the teeth of the zipper or rungs of the ladder
of the DNA molecule?
_______________ 8. Give the specific name of structure “B”.
_______________ 9. What is the sequence on the right of the left is ATC?
_______________ 10. Circle the nucleotide.
Modified True and False: If the statement is true , write true. If the statement is false change the
underlined word or words to make it true. Write the correct word or words on the lines to the left of the
number.
_______________ 11. The centrioles are made up of DNA.
_______________ 12. In DNA, the structure of the 5 carbon sugars is different in all cells.
_______________ 13. In DNA, the nitrogen bases are different.
_______________ 14. Within a given organism the DNA in one body cell differs from the DNA in
another body cell.
_______________ 15. When all the DNA in all the chromosomes of the cell has been copied, there
are two copies of the organism’s genetic information.
_______________ 16. Replication of DNA occurs during prophase.
_______________ 17. Guanine is a purine.
_______________ 18. DNA is made up of small molecules, (building blocks) known as
nitrogen bases.
_______________ 19. The two strands of DNA can be held together because they are complementary
to each other.
_______________ 20. The bond that holds the nitrogen bases together is strong.
_______________ 21. DNA extraction is a relatively simple process.
_______________ 22. During DNA replication , each strand serves as a pattern to make a new DNA
molecule.
Fill in the blank with the correct words.
_______________ 23. Name the two men who were responsible for the discovery of the structure
_______________ 24. of DNA. (23 & 24)
_______________ 25. DNA is composed of two strands twisted together. What is this shape called?
_______________ 26. What are the names of the 4 nitrogen bases in DNA?
_______________ 27.
_______________ 28.
_______________ 29.
_______________ 30. The DNA in the chromosomes is copied in a process called…
Bonus:
What word does DNA stand for (spelling counts)?
____________________________________________________