Not true about eukaryotic gene:
**Core Concept**
Eukaryotic genes are complex structures that undergo various processes to be expressed, including transcription, splicing, and translation. The unique feature of eukaryotic genes is the presence of introns within the primary transcript, which are removed during RNA splicing before translation.
**Why the Correct Answer is Right**
Eukaryotic genes have a complex structure that includes both coding and non-coding regions. The primary transcript is initially transcribed from DNA to RNA, but it contains introns, which are non-coding regions that are removed during RNA splicing. The remaining coding regions, exons, are then joined together to form a mature mRNA molecule. This process is essential for the accurate translation of the gene into a protein.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because eukaryotic genes do have introns, which are removed during RNA splicing.
**Option B:** This option is incorrect because eukaryotic genes are transcribed into pre-mRNA, which undergoes splicing before being translated.
**Option C:** This option is incorrect because eukaryotic genes do not directly translate into proteins without undergoing RNA splicing.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that eukaryotic genes undergo RNA splicing, which removes introns and joins exons together to form a mature mRNA molecule. This process is crucial for accurate protein translation and is a key difference between eukaryotic and prokaryotic gene expression.
**Correct Answer: C. Eukaryotic genes directly translate into proteins without undergoing RNA splicing.**