Prepare for NEET Biology Molecular Basis of Inheritance (Genetic Code) with MCQs & PYQs on NEET.GUIDE. Access free practice, previous year questions, and expert insights to decode codon assignments and degeneracy of the genetic code.
NEET Questions / Botany / Molecular Basis of Inheritance / Genetic Code
Certain mutations in tRNA can suppress nonsense mutations in mRNA. This phenomenon is MOST directly related to alterations in which part of the tRNA?
Acceptor stem
D-loop
T\u03a8C loop
Anticodon loop
Imagine a scenario where a novel amino acid is discovered. If the existing genetic code must accommodate this new amino acid without altering the existing amino acid assignments, what is the MOST likely mechanism for achieving this?
Expansion of the codon length from three to four bases
Overlapping reading frames
Reassignment of a rarely used codon
Modification of the ribosome structure
Which of these scenarios would MOST likely lead to a frameshift mutation that affects the downstream amino acid sequence?
Substitution of one nucleotide for another
Deletion of three nucleotides in the coding sequence
Insertion of two nucleotides in the coding sequence
Inversion of a segment of DNA containing a multiple of three nucleotides
A researcher discovers a bacterial strain with an unusual genetic code. In this strain, the codon UAG, typically a stop codon, codes for tryptophan. Which of the following would be the MOST direct consequence of this altered genetic code?
Premature termination of protein synthesis
No effect on protein synthesis
Substitution of tryptophan with another amino acid
Elongation of proteins past the normal termination point
Wobble base pairing allows a single tRNA to recognize multiple codons. Which position of the codon exhibits the MOST flexibility in wobble pairing?
First base
Second base
Third base
All bases exhibit equal flexibility
Which of the following is NOT a characteristic of the genetic code?
Universal
Degenerate
Non-ambiguous
Overlapping
