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Worksheet dna structure and replication answer key
Biology
Honors
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Name: _______________________________________________ Date: __________ Period: _______ Worksheet – Structure of DNA and Replication Directions: Label the diagram below with the following choices: - Nucleotide • Deoxyribose • Phosphate group - Base pair • Hydrogen bond • Nitrogenous base 1. ____________________ 3. ____________________
5. __________________
6. ____________________
4. ____________________
2. ____________________
Hydrogen bond Nucleotide Phosphate Group Nitrogenous Base Base Pair Deoxyribose Answer Key
Directions: Complete each sentence. 7. Guanine, cytosine, thymine, and __________________ are the four __________________ in DNA. 8. In DNA, guanine always forms hydrogen bonds with __________________. 9. The process of __________________ produces a new copy of an organism’s genetic information, which is passed on to a new cell. 10. The double coiled, “staircase” shape of DNA is called a __________________. Directions: Answer each question, you do not need complete sentences. 11. What do the letters DNA stand for? 12. Where is DNA found? 13. What is the first step in the process of DNA replication? 14. Which enzyme is responsible for “unzipping” the DNA double helix? 15. Which enzyme is responsible for bonding the nucleotides in a new DNA molecule? 16. If the sequence of one single strand of DNA is C-A-A-G-T-A-G-G-C-T, what is the sequence of the complementary strand? adenine bases cytosine replication helix Deoxyribonucleic Acid For eukaryotes, DNA is found in the nucleus. For prokaryotes, DNA is found in the cytoplasm. Helicase comes in and unzips the helix by breaking hydrogen bonds. Helicase Polymerase G-T-T-C-A-T-C-C-G-A
- The model of DNA below is ready to be copied. Compared to the original double helix, evaluate the copies made during three attempts of DNA replication. List any errors with the replication if they occurred: Replication # A T A T T A T A C G C G C G AND A G G C G C T A T A G C G C Replication # A T A T T A T A C G C G C G AND C G G C G C T A T A G C G C
- Complete the diagram on the left. Then circle the areas in the diagram on the right that show a genetic mutation. DNA Correctly Copied DNA Incorrectly Copied
- Explain how the mutations might have been caused in the diagram above.
A T
T A
C G
C G
G C
T A
G C
A G C T A T A
A G C T A T A
A T
G C
C G
T A
A T
T G
A T
G T
G C
C G
T A
A T
C A
A T
List problems if any: List problems if any: Original See highlighted None Many things may have caused the mutations above. DNA Polymerase may have missed this in it's proofreading phase. Also, it could have changed after it was correctly pair due to environmental conditions.
