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If there are 999 bases in an RNA that codes for a protein with 333 amino acids, and the base at position 901 is deleted such that the length of the RNA becomes 998 bases, how many codons will be altered?
Explanation
Deletion at base 901 shifts the frame of codons 301–333.
Detailed Solution
If deletion occurs at the 901st position, the remaining 98 bases, specifying 33 codons, will be altered (frameshift from codon 301 to 333).
Note: the opening words of this question ('If there are 999 bases in an RNA that codes for a') are cut off in the source PDF and have been restored from the official NEET 2017 paper.