0 0 votes How many different protein sequences of $100$ residues can be generated using $20$ standard amino acids? $100^{20}$ $100 \times 20$ $20^{100}$ $100! \times 20!$ Biochemistry gate2015 biochemistry numerical-answers protein aminoacids + – Milicevic3306 7.9k points answer comment Share Follow 0 reply Please log in or register to add a comment.