Question

Which of the following is/are common to both prokaryotic and eukaryotic gene expression?

• A. Coupled transcription and translation
• B. Post-translational modification
• C. Genetic code
• D. Presence of the sequence TATA in the promoter

Hint:

Universal genetic code = common link among all living organisms. Exceptions are rare (e.g., in mitochondria).

Answer 1

The Correct Option is B, C, D

Step 1: Compare features of gene expression.
- In prokaryotes, transcription and translation are coupled, and there are no introns or nucleus.
- In eukaryotes, transcription occurs in the nucleus, and translation occurs in the cytoplasm.
Step 2: Evaluate each statement.
(A) False — Coupled transcription–translation occurs only in prokaryotes.
(B) False — Post-translational modifications are more prominent in eukaryotes.
(C) True — The genetic code is universal across both.
(D) False — The TATA box occurs mainly in eukaryotic promoters.
Step 3: Conclusion.
Hence, the correct answer is (C) Genetic code.