boot sector : virus runs on start up of the computer.
program: virus runs when you run a specific program.
A multipartite virus is a combination of a boot sector virus and a file virus. It can hide in either type of program.
Boot Sector Virus
File Viruses infect applications. These viruses usually infect COM and/or EXE programs, though some can infect any program for which execution or interpretation is requested, such as SYS, OVL, OBJ, PRG, MNU and BAT files. System Sector Viruses infect executable code found in certain system areas on a disk. Macro Virus a program or code segment written in the internal macro language of an application and attached to a document file (such as Word or Excel).
A virus runs in a thread, as do all programs. The difference between a generic thread and a virus is that the thread may not be harmful, while the virus generally is.
FALSE
A virus is a computer program designed in some way to harm the way a computer functions. A firewall protects against viruses and other unwanted programs.
multipartite virus
The difference between a common animal virus and a retrovirus is that a retrovirus only contains RNA while a common animal virus will have DNA or RNA.
A pathogenic bacterium is alive while a virus is not.
(1) file virus (2) boot sector virus
A boot sector virus is a computer virus that puts itself in the boot sector of a computer. The boot sector is the partition on the disk drive that contains all of the programs and files necessary for the computer to start up. This ensures that the virus will be executed once the computer is turned on.
Computer virus' attack switches whereas human virus' affect cells.