Q.What type of glycosidic linkage joins the glucose units of cellulose, and how does this differ from the linkage in amylose?

Cellulose is an unbranched, linear polymer of D-glucose units, joined together by $\beta$-1,4-glycosidic linkages -- bonds running from C1 of one glucose unit to C4 of the next, in which the linkage oxygen sits on the 'beta' (above-the-ring) face at the anomeric carbon.

This is structurally very similar to amylose, which is also an unbranched chain of D-glucose units joined from C1 to C4 -- but amylose's linkage is instead an $\alpha$-1,4-glycosidic linkage, with the linkage oxygen on the opposite, 'alpha' (below-the-ring) face. So the two linkages connect exactly the same pair of ring carbons (C1 and C4); the only difference is the stereochemical orientation ($\alpha$ versus $\beta$) at the anomeric carbon forming the bond. This single stereochemical difference, small as it looks on paper, has a large structural consequence: it forces the $\beta$-linked cellulos …

Compare the two linkages' connectivity (both C1 to C4) against their stereochemistry ($\alpha$ for amylose, $\beta$ for cellulose) to see tha …

Assuming cellulose and amylose must differ in which ring carbons are joined (e.g. 1,4 vs 1,6) -- both use the same 1,4 connectivity; the rea …