Biology worksheet designed to test students' knowledge of DNA structure and the replication process through labeling and sequencing exercises.

DNA and Replication Worksheet with diagram labeling and fill-in-the-blank questions.

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1. deoxyribose
2. phosphate group
3. nitrogen base
4. hydrogen bonds
5. base pair
6. sugar-phosphate backbone
7. adenine (A), thymine (T)
8. complementary base pairing
9. nucleotides
10. DNA replication
11. double helix
12. The two ladder-forming outer rails of the 'ladder' are made of alternating sugar and phosphate groups. The 'rungs' are made of pairs of nitrogen bases. Each rung is identical to the one before it. As each broken rung is repaired, a new strand forms that is identical to the original strand. This process is called semiconservative replication. The 'zipper' is really the process of replication. The two ladder-forming outer rails of the 'ladder' snap apart. This is caused by an enzyme that pulls apart the strands, unzipping it.

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