If one strand of DNA has the nitrogenous base sequence as ATCTG, what would be the complementary RNA strand sequence ?

Options

A. UAGAC
B. AACTG
C. ATCGU
D. TTAGU

Answer

To find the complementary RNA strand sequence from the given DNA strand sequence (ATCTG), we can follow these steps:

### Step 1: Identify the DNA Base Pairing Rules
In DNA, the base pairing rules are:
- Adenine (A) pairs with Thymine (T)
- Thymine (T) pairs with Adenine (A)
- Cytosine (C) pairs with Guanine (G)
- Guanine (G) pairs with Cytosine (C)

### Step 2: Convert DNA Bases to RNA Bases
In RNA, the base pairing rules change slightly:
- Adenine (A) pairs with Uracil (U) instead of Thymine (T)
- Thymine (T) is not present in RNA
- Cytosine (C) still pairs with Guanine (G)
- Guanine (G) still pairs with Cytosine (C)

### Step 3: Write the Complementary RNA Sequence
Given the DNA sequence: **ATCTG**
- A (Adenine) pairs with U (Uracil)
- T (Thymine) pairs with A (Adenine)
- C (Cytosine) pairs with G (Guanine)
- T (Thymine) pairs with A (Adenine)
- G (Guanine) pairs with C (Cytosine)

Putting this together, we get:
- A → U
- T → A
- C → G
- T → A
- G → C

Thus, the complementary RNA strand sequence is **UAGAC**.

### Final Answer:
The complementary RNA strand sequence for the DNA sequence ATCTG is **UAGAC**.

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