BIOD 171 Essential Microbiology Portage Learning Module 6

ace 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: Your Answer: Attachment: Viral receptops bind to host proteins on surface Entry: Virus fuses with host membrane and enter cell Uncoating: Capsid disassembles Replication: Viral genome create blueprint to make copies of itself Exit: New viruses are produced and exit the cell New Infection: newly produced viruses leave the host cell and travel to infect other cells and then the whole process begins again 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. 4/10 Question 11 5 / 5 pts True or False. Structurally, bacteriophages are distinct from viruses that infect plant or animal cells. Correct Answer True You Answered False Question 10 5 / 5 pts Identify the following components of a bacteriophage. 1-[answer1] 2- [answer2] 3- [answer3] 4- [answer4] 5- [answer5] Your Answer: 1. Capside 2. Collar 3. Tail 4. Base Plate 5. Tail Fibers 1-Capsid 2- Collar 3- Tail 4- Base plate 5- Tail fibers 5/10 You Answered 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. Your Answer: Low because of the number of intact bacterial cells + the amount of virus in the tube should be low. Media should look/be clear as bacterial cells get destroyed. Based on the following image, would you expect the viral titer to be high or low? Why? Question 12 5 / 5 pts Which of the following can be spread via airborne particles: Measles Question 13 0 / 2 pts Describe the main differences between lytic and temperate phages. Your Answer: Lytic phages replicate from within the host bacteria until rupturing while temperate phages exist in a nonreplicative state but won't kill the host Lytic bacteriophages replicate within the host bacteria until it ruptures, whereas temporate (or lysogenic) phages primarily exist in a non-replicative state that does not kill the host cell. Lytic phages replicate all viral proteins needed for the assembly of new virus particles whereas lysogenic phage genomes are integrated into the host genome but production of viral proteins is suppressed.