Portage Microbiology BIOD171 Exam 6 Questions and Answers 2024

Portage Microbiology BIOD171 Exam 6 Questions and Answers 2024 True or False. Because the genome is contained within an enclosed space (much like the nucleus of a cell), viruses are classified as eukaryotic. -Answer-False. Viruses are neither eukaryotic nor prokaryotic. Describe the two basic components of a virus. -Answer-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. The ________ surrounds the capsid of some viruses. -Answer-envelope True or False. You would expect to see a viral envelope on a virus infecting a plant cell. -Answer-False. The overwhelming majority of animal viruses are enveloped whereas the majority of plant or bacteria-infecting viruses are not. Rank the following viruses based on their size from largest to smallest: Orthomyxovirus Poliovirus Variolavirus -Answer-1. Variolavirus 2. Orthomyxovirus 3. poliovirus Variolavirus (~200nm) > Orthomyxovirus (100-150nm) > Poliovirus (~30nm) True or False: Highly infectious viruses undergo genome replication prior to viral attachment and entry. -Answer-False. The viral genome is never replicated before attachment and entry regardless of its level of infectivity. 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: -Answer-1. attachment- the viral receptors attach to the host cell's proteins 2. entry- the virus takes part of the cell's membrane and enters the cell 3. uncoating- capsid is dissembled 4. replication- the viral genomic material is taken as the blueprint and replicated 5. release- the new viruses are released from the host cell 6. new infection: the new viruses infect other cells A virus that infects bacteria is called a [answer1] and contains a [answer2] -sided polygon capsid. -Answer-1. Bacteriophage 2. 20 True or False. Structurally, bacteriophages are similar to viruses that infect animals. - Answer-False. Bacteriophages have a distinct composition and structure. Identify the following components of a bacteriophage. -Answer-1. capsid