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
Related Questions
AUG codes for?
Valine
Glutamic acid
Phenyl alanine
Methionine
The codon AUG is responsible for which of the following?
Coding for phenylalanine
Termination of translation
Coding for lysine
Initiation of translation and coding for methionine
A mutation changes a codon from UCU (Serine) to UCC (Serine). What type of mutation is this?
Missense mutation
Nonsense mutation
Frameshift mutation
Silent mutation
Which of the following is NOT a stop codon?
UAA
UAG
UGA
AUG
Which of the following modifications to the mRNA sequence will NOT cause a frameshift mutation?
Insertion of G at position
Deletion of GCG at , and position
Deletion of A at position
Insertion of AU at and position
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
What does it mean that the genetic code is non-ambiguous?
Each codon can code for multiple amino acids.
Each codon codes for only one specific amino acid.
The code is read in a overlapping manner.
The code is different in different organisms.
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
Recombinant DNA technology allows the production of human proteins in bacteria. If the genetic code were NOT universal, which outcome would be MOST likely?
Bacteria would produce human insulin.
Bacteria would produce bacterial insulin.
Bacteria would produce a different protein or no protein.
Bacteria would not be able to transcribe the human insulin gene.
Which of the following is not applicable to genetic code?
Degenerate
Ambiguous
Universal
Triplet
