Answer the following (2 pts each) 1. which of the following describes the dimethyloxytrityl (dmt) group? a. it is a chemical blocking group that is easily removed from the 5’oh by trichloroacetic acid (tca) b. during the chemical synthesis of dna, nucleotides are added in the 3’  5’ direction, therefore the 3’oh of an incoming nucleotide must be activated, but the 5’oh must be blocked c. its strong orange color can be optically measured to approximate the efficiency of dmt removal d. b and c only e. all of the above g