PORTAGE LEARNING: MICROBIOLOGY MODULE 6 QUESTIONS WITH VERIFIED ANSWERS

Can viruses be classified as either prokaryotic or eukaryotic microorganisms? - ANSWERNeither What is an obligate intracellular parasite? - ANSWERViruses are considered obligate intracellular parasites because they can not replicate on their own. What is a viral capsid? - ANSWERThe capsid is a membrane-like protective structure that contains the genetic material, similar to the nucleus of a eukaryotic cell. Describe the appearance of a bacterial culture infected with virus at the time of infection versus later once viral replication is occurring at a high rate. - ANSWERIt goes from cloudy to clear What are the two key glycoproteins found in the influenza virus? - ANSWERHA and N How does the viral envelope both aid in cell entry as well as hide it from being detected by the immune system? - ANSWERThe viral envelope contains the necessary proteins required for interaction with host cells. As the envelope is derived from the host cell membrane, this camouflages the virus and lowers the likelihood of immune detection by making it appear similar to the normal biological host cell. What must happen before viral replication of its genome can occur? - ANSWERFor all viruses, the genome is replicated following attachment and entry, never before. What is the viral envelope, and what does the presence (or absence) of it tell you about the type of virus? - ANSWERThe envelope surrounds the viral capsid, is derived from the host cell membrane and serves as an additional barrier to the external environment. What type of microscope would be used to study the shape of a viral capsid? - ANSWERAn electron microscope What is a bacteriophage? - ANSWERA virus that infects bacteria