Question

1. in the space below, create a simplified model of your dna. use the appropriate letters to represent the nitrogen bases, and be sure to follow the base - pairing rule.
2. what are the three parts of a nucleotide in a dna molecule?
3. describe what is found in the \backbone\ of a strand of dna. what is it composed of?
4. describe what base - pairing means. what did you have to pay attention to when you building your dna molecule model?
5. what is an advantage to building a model of dna? what are two limitations of the you created? what properties of dna cannot be demonstrated using this model?

Explanation:

1. A simple DNA model could be a short sequence like AT - TA, CG - GC following base - pairing rules (A with T, C with G).
2. A nucleotide in DNA has a deoxyribose sugar, a phosphate group, and a nitrogen - containing base.
3. The DNA backbone consists of alternating deoxyribose sugar and phosphate groups.
4. Base - pairing means adenine (A) pairs with thymine (T) and cytosine (C) pairs with guanine (G). When building a model, one must ensure correct pairings.
5. Advantage: Helps visualize structure. Limitations: Can't show dynamic processes like replication or chemical bond details precisely.

Answer:

1. Example: AT - TA, CG - GC
2. Deoxyribose sugar, phosphate group, nitrogen - containing base
3. Alternating deoxyribose sugar and phosphate groups
4. Adenine (A) pairs with thymine (T), cytosine (C) pairs with guanine (G). Ensure correct pairings.
5. Advantage: Visualize structure. Limitations: Can't show dynamic processes or chemical bond details precisely.