If the base sequence along one side af a DNA molecule is TTCGA, then the complementary sequence of bases on the other side of the DNA molecule is :

Options

A. AAGCT
B. TTCGA
C. GGTAC
D. UUGCA

Explanation

To find the complementary sequence of bases for the DNA strand with the sequence TTCGA, we will follow these steps:

### Step-by-Step Solution:

1. **Identify the Base Pairing Rules**:
- In DNA, the bases pair as follows:
- Adenine (A) pairs with Thymine (T)
- Thymine (T) pairs with Adenine (A)
- Cytosine (C) pairs with Guanine (G)
- Guanine (G) pairs with Cytosine (C)

2. **Write Down the Given Sequence**:
- The given sequence is: **TTCGA**

3. **Apply the Complementary Base Pairing**:
- Now, we will find the complementary bases for each base in the given sequence:
- T (Thymine) pairs with A (Adenine)
- T (Thymine) pairs with A (Adenine)
- C (Cytosine) pairs with G (Guanine)
- G (Guanine) pairs with C (Cytosine)
- A (Adenine) pairs with T (Thymine)

4. **Write the Complementary Sequence**:
- Based on the pairings:
- T → A
- T → A
- C → G
- G → C
- A → T
- Therefore, the complementary sequence is: **AAGCT**

5. **Final Answer**:
- The complementary sequence of bases on the other side of the DNA molecule is **AAGCT**.