Multiple choice Which of the following is not a pair of equivalent PAM and Blossum matrices? PAM100 and Blosum90 PAM120 and Blosum80 PAM160 and Blosum60 PAM200 and Blosum45 All are equivalent pairs. Reveal answer Fill a bubble to check yourself D Correct answer Explanation Correct answer. It is not a pair of equivalent matrices. PAM200 is equivalent to Blosum52. PAM250 is equivalent to Blosum45.