BIOD 171 Exam 6 study set Questions With Complete Answers!!

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 Describe the two basic components of a virus. - Answer-1. Genomic material (DNA and RNA) 2. Capsid (membrane-like structure that contains genetic material) The envelope surrounds the _________ of some viruses. - Answer-capsid True or False. You would expect to see a viral envelope on a virus infecting a plant cell. - Answer-False Rank the following viruses based on their size from largest to smallest: Paramyxovirus Poliovirus Smallpox virus - Answer-smallpox>paramyxovirus>polio True or False: Highly infectious viruses undergo genome replication prior to viral attachment and entry. - Answer-False 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 virus attaches the host cell through proteins on the host cell. 2. Entry: the virus fuses with the host cell's membrane and enters the cell. 3. Uncoating: the capsid is disassembled4. Replication: Using genomic material from the virus, the virus replicates within the host cell. 5. Release: new virus cells exit the host cell and are released. 6. New Infection: the process continues resulting in an infection. 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 distinct from viruses that infect plant or animal cells. - Answer-True Identify the following components of a bacteriophage. - Answer-1. capsid 2. collar 3. tail 4. base plate 5. tail fibers Describe the main differences between lytic and temperate phages. - Answer-In lytic phages, replication continues to occur until the host cell dies. In temperate phages, replication and cell death do not occur. Based on the following image, would you expect the viral titer to be high or low? Why? - Answer-Low. As turbidity is a function of the number of intact bacterial cells present in the media, the amount of virus contained within the above tube must be low. As the lytic cycle continues more and more bacterial cells will be destroyed, effectively clearing the media. Which of the following can be spread via airborne particles: measles mumps rubella A and B All of the above - Answer-All of the above.