Cut-out template showing the four nitrogenous bases, deoxyribose sugar, and phosphate groups used to model DNA structure.

Problem Analysis:

The image shows components of DNA nucleotides and their complementary base pairing. The task appears to be matching the nucleotide bases (Adenine, Thymine, Guanine, Cytosine) with their respective complementary bases and understanding how they form a DNA strand using deoxyribose sugar and phosphate groups.

Key Concepts:

1. DNA Nucleotides:
- Each nucleotide consists of three parts:
- A nitrogenous base (Adenine, Thymine, Guanine, or Cytosine).
- A deoxyribose sugar.
- A phosphate group.

2. Base Pairing Rules:
- Adenine (A) pairs with Thymine (T).
- Guanine (G) pairs with Cytosine (C).
- These pairings are specific due to hydrogen bonding:
- A-T: 2 hydrogen bonds.
- G-C: 3 hydrogen bonds.

3. Structure of DNA:
- DNA is a double helix formed by two complementary strands running in opposite directions.
- The strands are held together by hydrogen bonds between the complementary bases.
- The backbone of each strand is composed of alternating deoxyribose sugars and phosphate groups.

Solution Approach:

To solve this problem, we need to:
1. Identify the complementary base pairs.
2. Understand how these pairs fit into the structure of DNA.
3. Match the given components (bases, sugar, and phosphate) to form nucleotides and then connect them to form a DNA strand.

#### Step 1: Identify Complementary Base Pairs
- Adenine (A) pairs with Thymine (T).
- Guanine (G) pairs with Cytosine (C).

#### Step 2: Form Nucleotides
Each nucleotide consists of:
- A nitrogenous base.
- A deoxyribose sugar.
- A phosphate group.

From the image:
- The deoxyribose sugar is shown as a pentagon with a dot (representing the base) and a square (representing the phosphate group).
- The bases (Adenine, Thymine, Guanine, Cytosine) are shown separately.
- The phosphate groups are also shown separately.

#### Step 3: Connect Nucleotides to Form a Strand
- The deoxyribose sugar and phosphate groups form the backbone of the DNA strand.
- The bases extend inward and pair with their complements on the opposite strand.

#### Step 4: Match Components
- Match Adenine with Thymine.
- Match Guanine with Cytosine.
- Attach each base to a deoxyribose sugar.
- Connect the sugars with phosphate groups to form the backbone.

Final Answer:

The solution involves pairing the bases correctly and understanding their arrangement in a DNA strand:
1. Adenine (A) pairs with Thymine (T).
2. Guanine (G) pairs with Cytosine (C).
3. Each base attaches to a deoxyribose sugar, and the sugars are connected by phosphate groups to form the backbone of the DNA strand.

The completed structure would look like this (conceptually):
- One strand: A-T-G-C
- Opposite strand: T-A-C-G

Thus, the final answer is:
\[
\boxed{\text{Adenine pairs with Thymine, and Guanine pairs with Cytosine.}}
\]