. 5′ TTACGTAC-3′ after transcription what will be the RNA:
## Core Concept
The question tests the understanding of **transcription**, the process of creating a complementary RNA molecule from a DNA template. During transcription, the RNA sequence is complementary to the DNA template strand, except that RNA contains **uracil (U)** instead of **thymine (T)**.
## Why the Correct Answer is Right
Given the DNA template sequence **5' TTACGTAC-3'**, the RNA transcript will be complementary to this sequence. Using the base pairing rules (**A-T/U**, **G-C**, **C-G**, **T-A/U**), the complementary RNA sequence is synthesized in the **5' to 3' direction**. So, for the DNA template **5' TTACGTAC-3'**, the RNA sequence will be **5' AUGCAUG-3'** (since **T** pairs with **A**, **T** pairs with **A**, **A** pairs with **U**, **C** pairs with **G**, **G** pairs with **C**, **T** pairs with **A**, **A** pairs with **U**, **C** pairs with **G**).
## Why Each Wrong Option is Incorrect
- **Option A:** This option would be incorrect because it does not accurately reflect the complementary RNA sequence based on the given DNA template.
- **Option B:** This option is incorrect for the same reason as Option A; it doesn't correctly complement the DNA template provided.
- **Option D:** This option is incorrect as it also fails to provide the correct RNA complement to the DNA template sequence.
## Clinical Pearl / High-Yield Fact
A key point to remember is that during transcription, **uracil (U) replaces thymine (T) in the RNA product**. This is crucial for distinguishing between DNA and RNA sequences and understanding the central dogma of molecular biology.
## Correct Answer Line
**Correct Answer: C. 5' AUGCAUG-3'**