Molecular Basis Of Inheritance

In the DNA double helix, the distance between two consecutive base pairs is approximately 0.34 nanometers (nm).
This is equal to .
Hence, both options (B) and (C) are correct.

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:
- 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.

Step 1: Codons are sequences of three nucleotides in mRNA that specify amino acids.
Step 2: AUG is unique because it acts as a **start codon**—it signals the beginning of translation.
Step 3: In addition, AUG also codes for the amino acid **methionine**.
Step 4: No other codon has both roles—initiation and amino acid coding.