Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYMolecular Basis of Inheritance1 Mark
MCQ
Codons that do not code for amino acids are:
A
Phosphates
B
$\text{ATP}$
C
Start and stop signals
✓
Nonsense
✓
Answer
Correct option: D.
Nonsense
Codons are the nucleotide base triplets that specify a particular amino acid in proteins.
The codons that do cause termination of protein synthesis are known as stop codons.
The start codon specifies the first codon of $\text{mRNA}$ transcript that is translated by a ribosome.
It codes for methionine in eukaryotes and a modified Met in prokaryotes. $"\text{AUG}"$ is the most common start codon.
The codons that code for nothing, therefore there is no complementary $\text{tRNA}$ for these codons, are nonsense codons.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.