Let's go through the questions and provide clear explanations for each, especially focusing on the ones that are not fully visible or need clarification.
---
Completed Sentences (7–10):
7. Guanine, cytosine, thymine, and
adenine are the four
bases in DNA.
✔ *Explanation:* These are the four nitrogenous bases found in DNA: adenine (A), thymine (T), guanine (G), and cytosine (C). They pair up to form the rungs of the DNA ladder.
8. In DNA, guanine always forms hydrogen bonds with
cytosine.
✔ *Explanation:* Base pairing follows specific rules: A pairs with T (via two hydrogen bonds), and G pairs with C (via three hydrogen bonds).
9. The process of
replication produces a new copy of an organism’s genetic information, which is passed on to a new cell.
✔ *Explanation:* DNA replication is the process by which a cell copies its DNA before cell division so that each daughter cell receives an identical copy.
10. The double coiled, “staircase” shape of DNA is called a
helix.
✔ *Explanation:* The structure of DNA is a double helix — two strands twisted around each other like a spiral staircase.
---
Short Answer Questions (11–16):
11. What do the letters DNA stand for?
👉
Deoxyribonucleic Acid
✔ *Explanation:* "Deoxyribo" refers to the sugar component (deoxyribose), and "nucleic acid" refers to the type of molecule.
12. Where is DNA found?
👉
For eukaryotes, DNA is found in the nucleus.
👉
For prokaryotes, DNA is found in the cytoplasm.
✔ *Explanation:* Eukaryotic cells have a membrane-bound nucleus, while prokaryotes lack a nucleus and their DNA floats freely in the cytoplasm.
---
Now let’s address the
remaining questions, which appear blurry but can be inferred based on standard biology content:
---
13. What is the first step in the process of DNA replication?
👉
Unwinding the double helix (or separation of the two strands)
✔ *Explanation:* The enzyme
helicase breaks the hydrogen bonds between the base pairs, separating the two strands of DNA to form a replication fork.
---
14. Which enzyme is responsible for "unzipping" the DNA double helix?
👉
Helicase
✔ *Explanation:* Helicase unwinds the DNA by breaking hydrogen bonds between complementary bases, allowing replication to proceed.
---
15. Which enzyme is responsible for bonding the nucleotides in a new DNA molecule?
👉
DNA polymerase
✔ *Explanation:* DNA polymerase adds nucleotides to the growing DNA strand in the 5' to 3' direction, using the original strand as a template. It also proofreads for errors.
---
16. If the sequence of one single strand of DNA is C-A-A-G-T-A-G-C-T, what is the sequence of the complementary strand?
👉
G-T-T-C-A-T-C-G-A
✔ *Explanation:* Use base pairing rules:
- C → G
- A → T
- G → C
- T → A
So:
Original: C A A G T A G C T
Complement: G T T C A T C G A
---
✔ Final Answers Summary:
| Question | Answer |
|--------|--------|
| 13 | Unwinding the double helix (or separation of strands) |
| 14 | Helicase |
| 15 | DNA polymerase |
| 16 | G-T-T-C-A-T-C-G-A |
---
These answers reflect fundamental concepts in molecular biology related to DNA structure and replication. Let me know if you'd like a diagram or further explanation!
Parent Tip: Review the logic above to help your child master the concept of dna rna and replication worksheet.
![ANSWERED] DNA Replication Worksheet Use the diagram to answer the ...](/images2/dna-rna-and-replication-worksheet/dna-rna-and-replication-worksheet-10.jpg)