Brock Biology of Microorganisms (15th Edition)
15th Edition
ISBN: 9780134261928
Author: Michael T. Madigan, Kelly S. Bender, Daniel H. Buckley, W. Matthew Sattley, David A. Stahl
Publisher: PEARSON
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Textbook Question
Chapter 8.2, Problem 1MQ
- Distinguish between a capsid and a capsomere. What is a common symmetry for spherical viruses?
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Compare the structure of an icosahedral capsid with that of a helical capsid. How do pentamers and hexamers associate to form a complete icosahedron? Which virus would have a longer helical capsid: a virus with a 7,200 base pair DNA genome or one with an 11,000 base ssRNA genome?
What are the receptors to which animal viruses attach? What type on cell membrane?
Classification of viruses is based on all of the following excepta) type of nucleic acid. b) shape of virus.c) size of virus. d) host infected.e) strandedness of nucleic acid.
Chapter 8 Solutions
Brock Biology of Microorganisms (15th Edition)
Ch. 8.1 - How does a virus differ from a cell?Ch. 8.1 - Why does a virus need a host cell?Ch. 8.1 - Compared with cells, what is unusual about viral...Ch. 8.1 - Once inside a host prokaryotic cell, what are the...Ch. 8.2 - Distinguish between a capsid and a capsomere. What...Ch. 8.2 - What is the difference between a naked virus and...Ch. 8.2 - What kinds of enzymes can be found within the...Ch. 8.2 - Where does the envelope surrounding animal viruses...Ch. 8.3 - What is packaged into capsids during maturation?Ch. 8.3 - Explain the term burst size.
Ch. 8.3 - Prob. 3MQCh. 8.3 - Why does a one-step growth curve differ in shape...Ch. 8.4 - What is meant by a viral titer?Ch. 8.4 - What is a plaque-forming unit?Ch. 8.4 - What is meant by the term plating efficiency?Ch. 8.4 - Describe the events that occur on an agar plate...Ch. 8.5 - How does attachment contribute to virushost...Ch. 8.5 - Prob. 2MQCh. 8.5 - Prob. 3MQCh. 8.5 - What is required for a bacteriophage T4 virion to...Ch. 8.6 - Prob. 1MQCh. 8.6 - Give one example each of T4 early, middle, and...Ch. 8.6 - What is required to package the T4 genome into its...Ch. 8.6 - Bacteriophage T4 lacks its own RNA polymerase. How...Ch. 8.7 - What is a lysogen and what is a prophage?Ch. 8.7 - How does DNA replication in lambda differ from...Ch. 8.7 - What commits lambda to the lytic versus the...Ch. 8.7 - What enzyme is required to form a prophage, and...Ch. 8.8 - Prob. 1MQCh. 8.8 - What is the difference between a persistent and a...Ch. 8.8 - Prob. 3MQCh. 8.8 - Why can it be said that the retrovirus genome is...Ch. 8 - What causes the viral plaques that appear on a...Ch. 8 - The promoters on genes encoding early proteins in...Ch. 8 - Under some conditions, it is possible to obtain...
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- Mention one significant function of capsid in virus.arrow_forwardWhat structural features are common to all viruses? Which featuresare found only in certain types of viruses?arrow_forwardC) complex D) polyhedral 23. The first step in viral infection is the recognition between the virus and the host cell. Which of the following statements best describes how that occurs? A) The viral genome matches the host cell genome. B) Surface proteins on the virus are recognized by receptor proteins found in the plasma membrane of the host cell. C) The viral genome is recognized by the capsid that surrounds the host cell genome. D) The envelope on the virus is recognized by the host cell genome.arrow_forward
- What is the role of a capsid in a virus?arrow_forwardIn some viruses the flow of information is in reverse that is ,from RNA to DNA.can you suggest a simple name to the process?arrow_forwardWhat is an enveloped virus, and how does the envelope arise?What are spikes, how are they formed, and what is their function?arrow_forward
- a typical eukarytic cell has a diameter of 50 microns while a corona virus particles has a diameter of 100 nanometers. how many virus particles could be packed into the volum of the typical eurkaryotic cell? (assume the cell and the virus are spherical - V = 4/3 π R^3 and that the particles can use 100% of the space in the cell)arrow_forwardWhere do - ss RNA viruses assemble? O 1) golgi O 2) nucleus O3) cytoplasm O 4) both the nucleus and cytoplasm O 5) Endoplasmic reticulum Type:Sarrow_forwardWhich of the following viral components must get into a cell's cytoplasm in order for the virus to be replicated? A) Protein spikes B) The virus envelope C) The virus genome D) The virus capsidarrow_forward
- 27. Class VI animal viruses include HIV, Based on the type of viral genome, how is this class distinguished from the other classes of animal virus? A) It has double stranded RNA. B) It has single stranded RNA that serves as mRNA (positive sense). C) It has single stranded RNA that serves as a template for the synthesis of DNA. D) It has single stranded RNA that serves as a template for mRNA (anti-sense). does HIVarrow_forwardWhat is the mode of reproduction in viruses?arrow_forwardWhat is a nucleocapsid? Give examples of viruses with the twocapsid types.arrow_forward
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What Is A Virus ? ; Author: Peekaboo Kidz;https://www.youtube.com/watch?v=YS7vsBgWszI;License: Standard YouTube License, CC-BY