Chapter 3 virus and subvirus
Chapter 3 virus and subvirus
Section 1 Virus structure Euvirus: at least contains two components- nucleic acid and proteIn Subvirus: molecular pathogen includes: viroid(类病毒)— independent infectious RNA only virusoid(拟病毒)— non-independent infectious RNA only prion(朊病毒)—— protein only
Section 1 Virus structure Euvirus ：at least contains two components—— nucleic acid and protein Subvirus：molecular pathogen includes： viroid（类病毒） ——independent infectious RNA only virusoid（拟病毒）——non-independent infectious RNA only prion（朊病毒）——protein only
1. definitions Viruses are obligate intracellular parasites which can only be viewed with the aid of an electron microscope They vary in size from approximately 20-200 nm. In order to persist in the environment they must be capable of being passed from host to host and of infecting and replicating in susceptible host cells
Viruses are obligate intracellular parasites which can only be viewed with the aid of an electron microscope. They vary in size from approximately 20-200 nm. In order to persist in the environment they must be capable of being passed from host to host and of infecting and replicating in susceptible host cells. 1. definitions
A virus particle has thus been defined as a structure which has evolved to transfer nucleic acid from one cell to another a The nucleic acid found in the particle is either DNA or RNA, is single-or double-stranded and linear or segmented. In some cases the nucleic acid may be circular
A virus particle has thus been defined as a structure which has evolved to transfer nucleic acid from one cell to another. The nucleic acid found in the particle is either DNA or RNA, is single- or double-stranded and linear or segmented. In some cases the nucleic acid may be circular
The simplest of virus particles consists of a protein coat(sometimes made up of only one type of protein which is repeated hundreds of times which surrounds a strand of nucleic acid
The simplest of virus particles consists of a protein coat (sometimes made up of only one type of protein which is repeated hundreds of times) which surrounds a strand of nucleic acid