FULL TEST BANK For Fundamentals of Molecular Virology, 2nd Edition, Kindle Edition by Nicholas H. Acheson (Author) latest Update Graded A+ Graded A+

28) Viruses are not the only obligatory intracellular parasites. Describe how the replication of viruses is diferent than cellular organisms that replicate inside of cells, like chlamydiae and rickettsiae. Ans :: Unicellular parasitic cells that need to replicate inside of other cells do not replicate in the same way that viruses do. First of all, unicellular parasites have their own ribosomes to translate their mRNAs and do not use the host cell ribosomes, like viruses do. In addition they are intact cells that contain their genome entirely within their own cellular membranes and do not release their genome into the host cell, the way that viruses do. These cellular parasites undergo binary fission in the same way that independently living cells do. Viruses do not have their own ribosomes and actually disintegrate their virion, releasing the genome out of the capsid and into the cytoplasm before they begin their replication. They do not undergo binary fission. Package Title: Testbankproffessor Course Title: Acheson 2nd Edition ChapterNo: 02 Question type: Multiple Choice 1) The lipid membrane that surrounds the nucleocapsid of some virus particles is called the: a) matrix b) tegument c) capsid d) envelope e) glycoprotein Ans :: d 2) The nucleocapsid describes the structure that includes the: a) capsid and the genome b) capsid and the envelope c) envelope and the glycoproteins d) helical capsid and an envelope e) icosahedral capsid and an envelope Ans :: a 3) Depending on the type of virus, which of the next is a function of the virus capsid? a) To attach to the correct type of host cell. b) To protect the viral genome from nucleases. c) To ensure delivery of the genome into the host cell. d) To protect the viral genome from damage by UV light. e) All of the above functions are correct. Ans :: E 4) Virus particles can be visualized with which of the next? a) negative staining of virions with electron microscopy b) negative staining of virions with x-ray difraction c) negative staining of thin sections of infected cells with electron microscopy d) positive staining in cryoelectron microscopy 9 e) positive staining of infected cells with x-ray difraction Ans :: a 5) Most viruses that use a spherical shaped capsid arrange their capsid proteins with which of the next symmetries? a) cubic b) tetrahedral c) icosahedral d) dodecagon e) helical Ans :: c 6) Which of the next is NOT a characteristic of a regular icosahedron? a) It has 12 vertices of 5-fold symmetry. b) It has 20 triangular faces. c) It has 20 sides with 3-fold symmetry. d) It has 30 edges with 2-fold symmetry e) It has 6 square faces. Ans :: E