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study guide 3
viruses
| Question | Answer |
|---|---|
| A naked virus is a virus which does not have an envelope. How do naked viruses adsorb to a host cell? | via capsid proteins |
| If a capsid looks like a spiral, the capsid is called a | helical capsid |
| Some newly made viruses contain a gene from the host cell which, after viral infection, causes cell division which leads to cancer. In the host cell, such a gene is called a | proto-oncogene |
| A virus will package an enzyme in its capsid if the enzyme is needed immediately for causing an infection and the enzyme is not normally present in the host cell cytoplasm | true |
| All viruses have a capsid, but not all viruses have an envelope | true |
| Because a virus is dependent on a cell for making copies of a virus, it is called a(an) | obligate intracellular pathogen |
| Which of the following is an example of a virus which has dsDNA, icosahedral capsid but no envelope? | HPV,Human papilloma virus |
| The viral envelope is acquired from | the host cell membrane during budding |
| If a virus accidentally packages host cell DNA with viral DNA into the capsid, the virus is called a(n): | transducing virus |
| During the latent cycle, the virus might integrate into the host cell's chromosome. If the host cell is a bacterial cell, the integrated virus is called | Prophage |
| Which of the following is an example of a virus which has ssRNA, helical capsid, and an envelope? | Influenza |
| Capsomers are the building blocks for making a viral | capsid |
| If part of a cycle includes a stage when the viruses within a host cell are released by bursting or budding, the viral cycle is called | lytic |
| mechanisms by which viruses cause cancer? | a transducing virus carries a proto-oncogene which codes for a protein which causes cell division,a virus protein which is needed to build new viruses also causes the host cell to undergo mitosis |
| Viruses are often described as simple or primitive. Evidence for this includes | viruses have genomes which are smaller than either eukaryotes or bacteria,viruses depend upon a host cell for most of the enzymes and structures needed to make new viruses |
| What is the purpose of viral spikes protruding from the envelope? | for adsorption to a host cell |
| Budding is a process which | is not immediately lethal to the host cell and is used by some viruses to exit the host cell |
| Cancer is the second leading cause of death in the U.S. For all cancers, viruses cause | 15% |
| When analyzing the genetic material in a virus, one is surprised at how little genetic material is present. Unlike a cell, viruses do not have the genes for making all of the enzymes and structures needed for carrying out protein synthesis or replicating | True |
| Viral nucleic acid can be: | single-stranded DNA,double-stranded DNA, single-stranded RNA |
| If a virus adsorbs to a host cell and then penetrates (and if necessary, uncoats), but does not replicate, it is described as following the: | latent cycle |
Created by:
bennetta78
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