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?
11
33
333
1
the genetic code is a triplet and is read in a contiguous fashion. 999 bases code for 333 amino acids (999/3 = 333). A deletion at position 901 causes a frameshift mutation from that point onwards. The first 900 bases (coding for 300 amino acids) remain unaffected. The remaining codons (333 total - 300 unaffected = 33) corresponding to the sequence from base 901 onwards will be altered.
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