Plant fibers usually consist of structural carbohydrates such as cellulose in cell walls. Composed of repeating glucose units in long, single strands, cellulose cannot be digested by enzymes in the human intestine. Other plant fiber components include hemicellulose and pectin.
Mac OS is characterized by its monolithic system. From its original release through System 4, it ran only one application at a time. Even so, it was noted for its ease of use. Mac OS gained cooperative multitasking with System 5, which ran on the Macintosh SE and Macintosh II.
March 31, 2015. 1  Locate the operating system on your Mac computer using the Apple menu. The Apple menu is found in the top corner of your Mac's screen. 2  Click the Apple logo in the top-left corner of your screen to open the Apple menu. 3  Select About This Mac on the Apple menu to load the About This Mac dialog.