Review the Structure of DNA - Free Printable
Educational worksheet: Review the Structure of DNA. Download and print for classroom or home learning activities.
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Step-by-step solution for: Review the Structure of DNA
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Show Answer Key & Explanations
Step-by-step solution for: Review the Structure of DNA
The image you've uploaded appears to be a schematic representation of nucleic acid (DNA or RNA) structure, specifically focusing on the phosphate-sugar backbone and nitrogenous bases. Let's analyze it step by step.
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1. Left Side:
- Each row starts with a pentagon (representing a ribose or deoxyribose sugar) connected to a circle (representing a phosphate group).
- These are linked in a repeating pattern: Phosphate → Sugar → Phosphate → Sugar, forming the sugar-phosphate backbone.
2. Middle Section:
- The shapes labeled A, G, and others represent nitrogenous bases.
- These bases are attached to the sugar molecules.
- The dashed lines between the bases suggest hydrogen bonds.
3. Right Side:
- On the right side, we see complementary bases connected via dashed lines.
- This indicates base pairing between two strands — typical of double-stranded DNA.
4. Base Pairing:
- A (Adenine) is paired with T (Thymine) in DNA, or U (Uracil) in RNA.
- G (Guanine) pairs with C (Cytosine).
- In this diagram:
- A is paired with T (or possibly U if RNA).
- G is paired with C.
5. Directionality:
- The arrows indicate the 5' to 3' direction of the nucleotide strands.
- The top strand goes from 5' to 3' left to right, while the bottom strand runs antiparallel (3' to 5' left to right).
6. Structure:
- This is a double helix representation, with two antiparallel strands held together by hydrogen bonds between complementary bases.
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This diagram illustrates the structure of DNA (or RNA), showing:
- Sugar-phosphate backbone on both sides.
- Nitrogenous bases (A, G, etc.) projecting inward.
- Complementary base pairing via hydrogen bonds.
- Antiparallel orientation of the two strands.
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1. Double Helix Model – Proposed by Watson and Crick.
2. Base Pairing Rules:
- Adenine (A) pairs with Thymine (T) via 2 hydrogen bonds.
- Guanine (G) pairs with Cytosine (C) via 3 hydrogen bonds.
3. Antiparallel Strands – One strand runs 5'→3', the other 3'→5'.
4. Phosphodiester Bonds – Link sugars and phosphates in the backbone.
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Since no explicit question was asked, but the image shows a standard molecular biology diagram, the likely task is to:
> Identify the molecule and explain its structure.
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This is a diagram of a double-stranded DNA molecule.
- It shows two antiparallel strands with a sugar-phosphate backbone.
- Nitrogenous bases (A, G, C, T) pair complementarily: A with T, G with C.
- Hydrogen bonds (dashed lines) hold the two strands together.
- The structure represents the classic double helix model of DNA.
This structure is essential for genetic information storage and replication in cells.
Let me know if you'd like help labeling specific parts or identifying any missing elements!
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🔍 Observation of the Diagram:
1. Left Side:
- Each row starts with a pentagon (representing a ribose or deoxyribose sugar) connected to a circle (representing a phosphate group).
- These are linked in a repeating pattern: Phosphate → Sugar → Phosphate → Sugar, forming the sugar-phosphate backbone.
2. Middle Section:
- The shapes labeled A, G, and others represent nitrogenous bases.
- These bases are attached to the sugar molecules.
- The dashed lines between the bases suggest hydrogen bonds.
3. Right Side:
- On the right side, we see complementary bases connected via dashed lines.
- This indicates base pairing between two strands — typical of double-stranded DNA.
4. Base Pairing:
- A (Adenine) is paired with T (Thymine) in DNA, or U (Uracil) in RNA.
- G (Guanine) pairs with C (Cytosine).
- In this diagram:
- A is paired with T (or possibly U if RNA).
- G is paired with C.
5. Directionality:
- The arrows indicate the 5' to 3' direction of the nucleotide strands.
- The top strand goes from 5' to 3' left to right, while the bottom strand runs antiparallel (3' to 5' left to right).
6. Structure:
- This is a double helix representation, with two antiparallel strands held together by hydrogen bonds between complementary bases.
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✔ Conclusion:
This diagram illustrates the structure of DNA (or RNA), showing:
- Sugar-phosphate backbone on both sides.
- Nitrogenous bases (A, G, etc.) projecting inward.
- Complementary base pairing via hydrogen bonds.
- Antiparallel orientation of the two strands.
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🧬 Key Biological Concepts Illustrated:
1. Double Helix Model – Proposed by Watson and Crick.
2. Base Pairing Rules:
- Adenine (A) pairs with Thymine (T) via 2 hydrogen bonds.
- Guanine (G) pairs with Cytosine (C) via 3 hydrogen bonds.
3. Antiparallel Strands – One strand runs 5'→3', the other 3'→5'.
4. Phosphodiester Bonds – Link sugars and phosphates in the backbone.
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❓ What Is the Task?
Since no explicit question was asked, but the image shows a standard molecular biology diagram, the likely task is to:
> Identify the molecule and explain its structure.
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✔ Final Answer:
This is a diagram of a double-stranded DNA molecule.
- It shows two antiparallel strands with a sugar-phosphate backbone.
- Nitrogenous bases (A, G, C, T) pair complementarily: A with T, G with C.
- Hydrogen bonds (dashed lines) hold the two strands together.
- The structure represents the classic double helix model of DNA.
This structure is essential for genetic information storage and replication in cells.
Let me know if you'd like help labeling specific parts or identifying any missing elements!
Parent Tip: Review the logic above to help your child master the concept of dna activity worksheet.
