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- https://bio.libretexts.org/Courses/Manchester_Community_College_(MCC)/Remix_of_Openstax%3AMicrobiology_by_Parker_Schneegurt_et_al/09%3A_Acellular_Pathogens/9.01%3A_VirusesViruses are generally ultramicroscopic, typically from 20 nm to 900 nm in length. Some large viruses have been found. Virions are acellular and consist of a nucleic acid, DNA or RNA, but not both, sur...Viruses are generally ultramicroscopic, typically from 20 nm to 900 nm in length. Some large viruses have been found. Virions are acellular and consist of a nucleic acid, DNA or RNA, but not both, surrounded by a protein capsid. There may also be a phospholipid membrane surrounding the capsid. Viruses are obligate intracellular parasites.
- https://bio.libretexts.org/Courses/Northwest_University/MKBN211%3A_Introductory_Microbiology_(Bezuidenhout)/04%3A_VirusesThumbnail: This colorized transmission electron microscopic (TEM) image revealed some of the ultrastructural morphology displayed by an Ebola virus virion. (Public Domain; Frederick A. Murphy via CDC)...Thumbnail: This colorized transmission electron microscopic (TEM) image revealed some of the ultrastructural morphology displayed by an Ebola virus virion. (Public Domain; Frederick A. Murphy via CDC).
- https://bio.libretexts.org/Courses/Coastline_College/Book-_Cells_-_Molecules_and_Mechanisms_(Wong)/15%3A_Viruses_Cancer_and_the_Immune_System/15.01%3A_VirusesA virus has both genetic material and protein components, but it is not a living organism. It cannot self-replicate and is completely reliant on the cellular biochemistry of whatever host cell it has ...A virus has both genetic material and protein components, but it is not a living organism. It cannot self-replicate and is completely reliant on the cellular biochemistry of whatever host cell it has infected. The minimal definition of a virus is a nucleic acid genome inside of a protein shell, or capsid. There are variations of this, such as virions that have a membrane coat outside of the capsid, or some that have enzymes inside of the capsid alongside the genome.
- https://bio.libretexts.org/Courses/City_College_of_San_Francisco/Introduction_to_Microbiology_OER_-_Ying_Liu/07%3A_Viruses/7.03%3A_Viruses/7.3.01%3A_General_Characteristics_of_VirusesViruses are infectious agents with both living and nonliving characteristics. Living characteristics of viruses include the ability to reproduce – but only in living host cells – and the ability to mu...Viruses are infectious agents with both living and nonliving characteristics. Living characteristics of viruses include the ability to reproduce – but only in living host cells – and the ability to mutate. Nonliving characteristics include the fact that they are not cells, have no cytoplasm or cellular organelles, and carry out no metabolism on their own and therefore must replicate using the host cell's metabolic machinery.
- https://bio.libretexts.org/Courses/North_Central_State_College/BIOL_1550%3A_Microbiology_(2025)/07%3A_Viruses/7.03%3A_Viruses/7.3.01%3A_General_Characteristics_of_VirusesViruses are infectious agents with both living and nonliving characteristics. Living characteristics of viruses include the ability to reproduce – but only in living host cells – and the ability to mu...Viruses are infectious agents with both living and nonliving characteristics. Living characteristics of viruses include the ability to reproduce – but only in living host cells – and the ability to mutate. Nonliving characteristics include the fact that they are not cells, have no cytoplasm or cellular organelles, and carry out no metabolism on their own and therefore must replicate using the host cell's metabolic machinery.
- https://bio.libretexts.org/Bookshelves/Botany/Botany_(Ha_Morrow_and_Algiers)/02%3A_Biodiversity_(Organismal_Groups)/2.02%3A_Prokaryotes_and_Viruses/2.2.02%3A_VirusesViruses are generally ultramicroscopic, typically from 20 nm to 900 nm in length, though some larger viruses have been found. Viruses are acellular and consist of a nucleic acid, DNA or RNA, but not b...Viruses are generally ultramicroscopic, typically from 20 nm to 900 nm in length, though some larger viruses have been found. Viruses are acellular and consist of a nucleic acid, DNA or RNA, but not both, surrounded by a protein capsid. There may also be a phospholipid membrane surrounding the capsid. Viruses are obligate intracellular parasites.
- https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Biology_(Kimball)/19%3A_The_Diversity_of_LifeThis page outlines classifications of eukaryotic life, covering topics such as taxonomy, protists, plants, fungi, and invertebrates. It highlights model organisms like Arabidopsis thaliana and Drosoph...This page outlines classifications of eukaryotic life, covering topics such as taxonomy, protists, plants, fungi, and invertebrates. It highlights model organisms like Arabidopsis thaliana and Drosophila melanogaster, and includes a discussion on bacteria, archaea, and viruses. Notable pathogens like E. coli and anthrax are addressed, along with the rapid identification of microorganisms and the importance of viruses such as influenza and smallpox.
- https://bio.libretexts.org/Bookshelves/Microbiology/Microbiology_(Kaiser)/Unit_4%3A_Eukaryotic_Microorganisms_and_Viruses/10%3A_VirusesA virus is a small infectious agent that replicates only inside the living cells of other organisms. Viruses can infect all types of life forms, from animals and plants to microorganisms, including ba...A virus is a small infectious agent that replicates only inside the living cells of other organisms. Viruses can infect all types of life forms, from animals and plants to microorganisms, including bacteria and archaea.
- https://bio.libretexts.org/Courses/New_England_College/Microbiology_with_NEC/06%3A_Acellular_Pathogens/6.01%3A_VirusesViruses are generally ultramicroscopic, typically from 20 nm to 900 nm in length. Some large viruses have been found. Virions are acellular and consist of a nucleic acid, DNA or RNA, but not both, sur...Viruses are generally ultramicroscopic, typically from 20 nm to 900 nm in length. Some large viruses have been found. Virions are acellular and consist of a nucleic acid, DNA or RNA, but not both, surrounded by a protein capsid. There may also be a phospholipid membrane surrounding the capsid. Viruses are obligate intracellular parasites.
- https://bio.libretexts.org/Courses/Portland_Community_College/Cascade_Microbiology/06%3A_Acellular_Pathogens/6.1%3A_VirusesViruses are generally ultramicroscopic, typically from 20 nm to 900 nm in length. Some large viruses have been found. Virions are acellular and consist of a nucleic acid, DNA or RNA, but not both, sur...Viruses are generally ultramicroscopic, typically from 20 nm to 900 nm in length. Some large viruses have been found. Virions are acellular and consist of a nucleic acid, DNA or RNA, but not both, surrounded by a protein capsid. There may also be a phospholipid membrane surrounding the capsid. Viruses are obligate intracellular parasites.
- https://bio.libretexts.org/Courses/City_College_of_San_Francisco/Introduction_to_Microbiology_OER_-_Ying_Liu/01%3A_Introduction_to_Microbiology/1.02%3A_Introduction_to_MicrobiologyMicroorganisms are typically too small to be seen with the naked eye. Bacteria, fungi, viruses, protozoa, and algae are the major groups of microorganisms. The vast majority of microorganisms are not ...Microorganisms are typically too small to be seen with the naked eye. Bacteria, fungi, viruses, protozoa, and algae are the major groups of microorganisms. The vast majority of microorganisms are not harmful but rather beneficial. Microbiota refers to all of the microorganisms that live in a particular environment. A microbiome is the entire collection of genes found in all of the microbes associated with a particular host.
