Beta-glucosidases are one of a number of cellulolytic enzymes involved in the degradation of cellulosic biomass. Catalyzes the last step releasing glucose from the inhibitory cellobiose (By similarity). Hydrolysis of terminal, non-reducing beta-D-glucosyl residues with release of beta-D-glucose. Glycan metabolism; cellulose degradation. Belongs to the glycosyl hydrolase 3 family. Extended N-terminus. Extended N-terminus.