4. Has a rigid cell wall made of peptidoglycan (except for the mycoplasma). This cell wall is thick in Gram-positive bacteria and thin in Gram-negative bacteria. It is the thickness of the peptidoglycan that accounts for the ability/lack of ability to retain the crystal violet used in the Gram stain.
Computer hardware is the physical parts or components of a computer, such as the monitor, mouse, keyboard, computer data storage, hard disk drive (HDD), graphic cards, sound cards, memory, motherboard, and so on, all of which are physical objects that are tangible.
This device receives or displays information FROM a computer (data goes out). Examples include a printer, speakers, or monitor. Hardware. This is a collection of all the parts of a computer that you can physically touch. This includes the monitor, keyboard, CPU, printer, and more. Software. This includes all electronic sets of instructions that tell a computer what task to perform.