DNA Base Pairing Worksheet - PDF Version

Problem Description:

The task involves understanding DNA base pairing and applying it to complete the complementary strands of DNA sequences. The image shows a DNA double helix with labeled bases (adenine and guanine) and provides several DNA sequences. The goal is to fill in the complementary bases for each given sequence.

Key Concepts:

1. DNA Base Pairing Rules:
- Adenine (A) pairs with Thymine (T).
- Guanine (G) pairs with Cytosine (C).

2. Complementary Strand:
- For a given DNA strand, the complementary strand is formed by replacing each base with its pair according to the rules above.

Solution Approach:

We will go through each provided DNA sequence and determine its complementary strand by applying the base pairing rules.

#### Given Sequences:
1. `ATCGTCAAGCTTCAG`
2. `TAGGCATCTGCACACT`
3. `GACCATACTCACGGAC`
4. `ACTCATGTACTGACT`
5. `CATGAACCCATGAG`

#### Step-by-Step Solution:

##### Sequence 1: `ATCGTCAAGCTTCAG`
- A pairs with T
- T pairs with A
- C pairs with G
- G pairs with C
- T pairs with A
- C pairs with G
- A pairs with T
- A pairs with T
- G pairs with C
- C pairs with G
- T pairs with A
- T pairs with A
- C pairs with G
- A pairs with T
- G pairs with C

Complementary Strand: `TAGCATTGCGAAGTC`

##### Sequence 2: `TAGGCATCTGCACACT`
- T pairs with A
- A pairs with T
- G pairs with C
- G pairs with C
- C pairs with G
- A pairs with T
- T pairs with A
- C pairs with G
- T pairs with A
- G pairs with C
- C pairs with G
- A pairs with T
- C pairs with G
- A pairs with T
- T pairs with A

Complementary Strand: `ATCCGTAGCGTGTAAT`

##### Sequence 3: `GACCATACTCACGGAC`
- G pairs with C
- A pairs with T
- C pairs with G
- C pairs with G
- A pairs with T
- T pairs with A
- A pairs with T
- C pairs with G
- T pairs with A
- C pairs with G
- A pairs with T
- C pairs with G
- G pairs with C
- G pairs with C
- A pairs with T
- C pairs with G

Complementary Strand: `CTGGTATGAGTGCCGT`

##### Sequence 4: `ACTCATGTACTGACT`
- A pairs with T
- C pairs with G
- T pairs with A
- C pairs with G
- A pairs with T
- T pairs with A
- G pairs with C
- T pairs with A
- A pairs with T
- C pairs with G
- T pairs with A
- G pairs with C
- A pairs with T
- C pairs with G
- T pairs with A

Complementary Strand: `TAGGTACATGAGTCGA`

##### Sequence 5: `CATGAACCCATGAG`
- C pairs with G
- A pairs with T
- T pairs with A
- G pairs with C
- A pairs with T
- A pairs with T
- C pairs with G
- C pairs with G
- C pairs with G
- A pairs with T
- T pairs with A
- G pairs with C
- A pairs with T
- G pairs with C

Complementary Strand: `GTACTTGGGTACTC`

Final Answer:

The completed complementary strands are:

1. `TAGCATTGCGAAGTC`
2. `ATCCGTAGCGTGTAAT`
3. `CTGGTATGAGTGCCGT`
4. `TAGGTACATGAGTCGA`
5. `GTACTTGGGTACTC`

\boxed{
\begin{aligned}
1. & \text{ TAGCATTGCGAAGTC} \\
2. & \text{ ATCCGTAGCGTGTAAT} \\
3. & \text{ CTGGTATGAGTGCCGT} \\
4. & \text{ TAGGTACATGAGTCGA} \\
5. & \text{ GTACTTGGGTACTC}
\end{aligned}
}