BIOD 171 Module 6 Exam.docx practice exam questions and answers |Portage Learning

1. True or False. Because the genome is contained within an enclosed space, (much like the nucleus of a cell) viruses are classified as eukaryotic. False. Viruses are neither eukaryotic nor prokaryotic. 2. Describe the two basic components of a virus. A virus has (1) genomic material comprised of either DNA or RNA and (2) a capsid, a membrane-like protective structure that contains the genetic material, similar to the nucleus of a eukaryotic cell. 3. The envelope surrounds the of some viruses. Capsid. 4. True or False. You would expect to see a viral envelope on a virus infecting a bacterial cell. False. The overwhelming majority of animal viruses are enveloped whereas the majority of plant or bacteria infecting viruses are not. 5. Rank the following viruses based on their size from largest to smallest: Paramyxovirus Poliovirus Smallpox virus Smallpox (~200nm) > Paramyxovirus (100-150nm) > Poliovirus (~30nm) 6. True or False: Viral replication occurs after it attaches and enters the host cell. True. The viral genome is never replicated before attachment and entry. 7. Place the following viral life cycle steps in order beginning with viral attachment and provide a description of each step. Uncoating: Release: Replication: Attachment: Entry: New infection: 3- Uncoating: the viral capsid disassembles 5-Release: New virus particles are produced and leave the cell 4-Replication: the viral genome is the ‘blueprint’ to make copies of itself 1-Attachment: viral receptors bind to host proteins on the surface of the cell 2-Entry: the virus fuses with the host membrane and enters the cell 6-New infection: newly produced viruses that left the host cell now go on to infect new cells. 8. A virus that infects bacteria is called a capsid. Bacteriophage; 20-sided and contains a -side polygon 9. True or False. Structurally, bacteriophages are similar to viruses that infect animals. False. Bacteriophages ha ........................................continued