Question

The flows of genetic information in central dogma are in which direction?

• A. Protein → RNA → DNA
• B. RNA → DNA → Protein
• C. DNA → Protein → RNA
• D. DNA → RNA → Protein

Hint:

Central dogma = DNA → RNA → Protein. Reverse transcription (RNA → DNA) occurs in retroviruses, but is not the standard pathway.

Answer 1

The Correct Option is D

The Central Dogma of molecular biology explains the flow of genetic information within a biological system.
It was proposed by Francis Crick and follows this sequence:
\[ \text{DNA} \xrightarrow{\text{Transcription}} \text{RNA} \xrightarrow{\text{Translation}} \text{Protein} \] - DNA is transcribed to form mRNA.
- mRNA is translated into a polypeptide chain (protein).
This is the universal pathway of gene expression in most organisms.