This guide assumes the activity includes labeling a nucleotide, identifying base pairs, and explaining the double helix. Subject: Biology / Life Sciences Grade Level: 9-12 (or introductory college) Activity Goal: Students will identify the components of a nucleotide, explain complementary base pairing, and describe the three-dimensional structure of DNA. Part 1: Label the DNA Nucleotide (Refer to a diagram of a single nucleotide)

| Diagram Label | Correct Answer | Key Description | | :--- | :--- | :--- | | | Phosphate Group | The negatively charged backbone component. | | B | Deoxyribose Sugar | The 5-carbon sugar unique to DNA (missing an oxygen on the 2' carbon). | | C | Nitrogenous Base | Adenine (A), Thymine (T), Cytosine (C), or Guanine (G). | | D | Phosphodiester Bond | The covalent bond linking the 3' carbon of one sugar to the 5' carbon of the next. | Part 2: Complementary Base Pairing Rules Question: If one DNA strand has the sequence A T G C C A T , what is the sequence of the complementary strand?

T A C G G T A

Activity Understanding Dna Structure Answer Key -

This guide assumes the activity includes labeling a nucleotide, identifying base pairs, and explaining the double helix. Subject: Biology / Life Sciences Grade Level: 9-12 (or introductory college) Activity Goal: Students will identify the components of a nucleotide, explain complementary base pairing, and describe the three-dimensional structure of DNA. Part 1: Label the DNA Nucleotide (Refer to a diagram of a single nucleotide)

| Diagram Label | Correct Answer | Key Description | | :--- | :--- | :--- | | | Phosphate Group | The negatively charged backbone component. | | B | Deoxyribose Sugar | The 5-carbon sugar unique to DNA (missing an oxygen on the 2' carbon). | | C | Nitrogenous Base | Adenine (A), Thymine (T), Cytosine (C), or Guanine (G). | | D | Phosphodiester Bond | The covalent bond linking the 3' carbon of one sugar to the 5' carbon of the next. | Part 2: Complementary Base Pairing Rules Question: If one DNA strand has the sequence A T G C C A T , what is the sequence of the complementary strand? activity understanding dna structure answer key

T A C G G T A

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