A template strand of DNA has base sequence CATGATTAC. New strand synthesized on it will be :

Options

A. GATCAUATG
B. GTACTAACG
C. GAACTAATG
D. GTACTAATG

Answer

To determine the base sequence of the new strand synthesized from the given template strand of DNA (CATGATTAC), we will follow the rules of complementary base pairing.

### Step-by-Step Solution:

1. **Identify the Template Strand**: The template strand provided is CATGATTAC.

2. **Apply Base Pairing Rules**: According to the rules of base pairing:
- Adenine (A) pairs with Thymine (T)
- Thymine (T) pairs with Adenine (A)
- Cytosine (C) pairs with Guanine (G)
- Guanine (G) pairs with Cytosine (C)

3. **Complementary Base Pairing**:
- C (from the template) pairs with G
- A pairs with T
- T pairs with A
- G pairs with C
- A pairs with T
- T pairs with A
- A pairs with T
- C pairs with G

4. **Construct the New Strand**: By applying the base pairing rules to each base in the template strand, we get:
- C → G
- A → T
- T → A
- G → C
- A → T
- T → A
- T → A
- A → T
- C → G

Therefore, the new strand synthesized will be: **GTACTAATG**.

5. **Check Against Options**: Now, we can check this result against the provided options:
- Option 1: G, A, T, C, A, U, A, T, G
- Option 2: G, T, A, T, A, A, C, G
- Option 3: G, A, A, C, T, A, A, T, G
- Option 4: G, T, A, C, T, A, A, T, G

The correct answer is **Option 4: GTACTAATG**.

### Final Answer:
The new strand synthesized on the template strand CATGATTAC will be **GTACTAATG**.