Exams › NEET › Biology

Under which of the following conditions will there be no change in the reading frame of following mRNA? 5′ AACAGCGCGUGCUAUU 3′

1. Insertion of G at 5th position
2. Deletion of G from 5th position
3. Insertion of A and G at 4th and 5th positions respectively
4. Deletion of GGU from 7th, 8th and 9th positions

Correct answer: Deletion of GGU from 7th, 8th and 9th positions

Solution

A reading frame stays unchanged when the number of nucleotides inserted or deleted is a multiple of 3. Deleting GGU removes exactly three bases, so the codon grouping downstream is preserved.

Related NEET Biology questions

• Which of the following is a transcription factor produced by a regulatory gene?
• Which of the following combination is false?
• Which scientist experimentally proved that DNA is the sole genetic material in bacteriophage?
• If the distance between two consecutive base pairs is 0.34 nm and the total number of base pairs of a DNA double helix in a typical mammalian cell is 6.6 × 10⁹ bp, then the length of the DNA is approximately
• Which of the following RNAs should be most abundant in animal cell?
• The final proof for DNA as the genetic material came from the experiments of:

⚔️ Practice NEET Biology free + battle 1v1 →