Question

Premature or incomplete protein synthesis happens due to:

• A. Nonsense mutation
• B. Mutation of promoter region
• C. Missense mutation
• D. Frameshift mutation

Hint:

Nonsense mutations lead to the production of truncated proteins by introducing premature stop codons.

Answer 1

The Correct Option is A

Step 1: Understanding Nonsense Mutation 
A nonsense mutation introduces a premature stop codon in the mRNA sequence, leading to incomplete or truncated protein synthesis. 
Step 2: Evaluating Other Options 
- Mutation of promoter region: Affects transcription initiation, not directly related to premature protein synthesis. 
- Missense mutation: Leads to an amino acid change but not premature termination. 
- Frameshift mutation: Alters the reading frame, but does not necessarily cause premature termination. 
Step 3: Conclusion 
Nonsense mutation is the primary cause of premature or incomplete protein synthesis.