DNA Paper Model - Cut, Color, and Paste Nucleotides - Free Printable

Problem Description:

The task is to arrange the given shapes to form a model of a DNA molecule. The image provides a legend for the components of DNA and several rows of shapes that need to be rearranged into a double helix structure.

Legend Explanation:

1. Deoxyribose: Represented by a blue pentagon.
2. Adenine (A): Represented by a green shape.
3. Thymine (T): Represented by a red shape.
4. Phosphate: Represented by a pink circle.
5. Guanine (G): Represented by an orange shape.
6. Cytosine (C): Represented by a yellow shape.
7. Hydrogen bonds: Represented by three connected dots (`○○○`).

Solution Approach:

To solve this problem, we need to:
1. Understand the structure of DNA:
- DNA is a double helix composed of two complementary strands.
- Each strand consists of a backbone made of alternating deoxyribose sugar and phosphate groups.
- Nucleotide bases (adenine, thymine, guanine, cytosine) are attached to the deoxyribose sugars.
- Base pairing occurs between the two strands: Adenine (A) pairs with Thymine (T), and Guanine (G) pairs with Cytosine (C).

2. Analyze the given rows of shapes:
- Each row represents a segment of one strand of DNA.
- We need to ensure that the base pairing rules are followed and that the backbones are correctly formed.

3. Rearrange the shapes:
- For each row, identify the deoxyribose sugars, phosphates, and nucleotide bases.
- Ensure that the bases are paired correctly across the two strands.
- Arrange the phosphates and deoxyribose sugars to form the backbone.

Step-by-Step Solution:

#### Observing the Rows:
Each row contains:
- Deoxyribose sugars (blue pentagons).
- Phosphates (pink circles).
- Nucleotide bases (green, red, orange, yellow shapes).
- Hydrogen bonds (`○○○`).

#### Identifying Components:
1. Deoxyribose: Blue pentagons.
2. Phosphate: Pink circles.
3. Nucleotide Bases:
- Green = Adenine (A)
- Red = Thymine (T)
- Orange = Guanine (G)
- Yellow = Cytosine (C)
4. Hydrogen Bonds: `○○○`.

#### Base Pairing Rules:
- A pairs with T.
- G pairs with C.

#### Rearranging the Shapes:
We need to form two complementary strands. Let's analyze the given rows and rearrange them accordingly.

##### Row 1:
- Pink circle (Phosphate) → Blue pentagon (Deoxyribose) → Yellow (Cytosine) → Hydrogen bonds (`○○○`) → Orange (Guanine) → Blue pentagon (Deoxyribose) → Pink circle (Phosphate).

This forms part of one strand.

##### Row 2:
- Pink circle (Phosphate) → Blue pentagon (Deoxyribose) → Green (Adenine) → Hydrogen bonds (`○○○`) → Red (Thymine) → Blue pentagon (Deoxyribose) → Pink circle (Phosphate).

This forms part of the complementary strand.

##### Row 3:
- Pink circle (Phosphate) → Blue pentagon (Deoxyribose) → Orange (Guanine) → Hydrogen bonds (`○○○`) → Yellow (Cytosine) → Blue pentagon (Deoxyribose) → Pink circle (Phosphate).

This continues the first strand.

##### Row 4:
- Pink circle (Phosphate) → Blue pentagon (Deoxyribose) → Red (Thymine) → Hydrogen bonds (`○○○`) → Green (Adenine) → Blue pentagon (Deoxyribose) → Pink circle (Phosphate).

This continues the complementary strand.

##### Row 5:
- Pink circle (Phosphate) → Blue pentagon (Deoxyribose) → Yellow (Cytosine) → Hydrogen bonds (`○○○`) → Orange (Guanine) → Blue pentagon (Deoxyribose) → Pink circle (Phosphate).

This continues the first strand.

##### Row 6:
- Pink circle (Phosphate) → Blue pentagon (Deoxyribose) → Green (Adenine) → Hydrogen bonds (`○○○`) → Red (Thymine) → Blue pentagon (Deoxyribose) → Pink circle (Phosphate).

This continues the complementary strand.

Final Arrangement:

By following the above steps, we can arrange the shapes into two complementary strands of DNA. The key is to ensure:
1. Each strand has a backbone of alternating deoxyribose and phosphate groups.
2. The nucleotide bases are correctly paired across the two strands (A-T and G-C).

Final Answer:

The shapes should be rearranged to form two complementary strands of DNA, with the bases paired as follows:
- Adenine (A) pairs with Thymine (T).
- Guanine (G) pairs with Cytosine (C).

The exact arrangement will depend on the specific sequence of bases in the given rows, but the general structure should follow the double helix pattern with correct base pairing.

$$
\boxed{\text{Rearrange the shapes to form two complementary strands with correct base pairing.}}
$$