Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 25.4, Problem 2R
Summary Introduction
To review:
The two main hypotheses of viral origin.
Introduction:
Viruses refer to the small infectious agent, which replicates only within the living cells of the other organisms. This can infect all different kinds of life forms, from plants and animals to microorganisms, involving archaea and bacteria. It affects the host organism and releases many identical copies of original virus.
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Chapter 25 Solutions
Life: The Science of Biology
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- What is an emerging virus? Give two examples. Propose an experiment to explain how an emerging virus could arise.arrow_forwardWhat scientific development was a crucial initial step to enhancing our knowledge of virus structure? A.) Development of new microscopy stains. B.) Invention of the electron microscope. C.) Development of DNA sequencing techniques. D.) Discovery of antibiotics. E.) Publication of Koch's postulates.arrow_forwardAll of the following apply to Luria and Delbruck’s 1943 study of mutation rates in E. Coli and T1 phage except: A) it served as an example of an inflexible test B) it involved looking for T1-resistant bacteria as an end measure C) it showed that numbers of mutant organisms observed after T 1 phage were added to the culture tended to vary from experiment to experiment D) it rejected the possibility of adaptive mutations E) it supported the concept of spontaneous mutation ratesarrow_forward
- What does a bacteriophage accomplish with lysogeny? O 1) it allows the bacteriophage to destroy the host cell's DNA. 2) it enables the bacteriophage to take over the cell. O 3) it speeds up the viral infection cycle. 4) it allows the bacteriophage to infect cells it would not normally infect. O 5) the genetic material of the bacteriophage can be passed on to future generations of infected cells.arrow_forwardwhat are the key contributors to and consequences of viral genome evolution, and why do RNA viruses evolve faster than DNA viruses?arrow_forwardAccording to the seven characteristics of life (1- composed of one or more cells, 2- compelx and organized, 3- respond to environment, 4- grow, develop, and reproduce, 5- obtain and use energy, 6- mainatin homeostasis, 7- allow for evolutionary adaptation), are viruses alive?arrow_forward
- Discuss the following statement: “mobile genetic elements are parasites. They are harmful to the host organism and therefore place it at an evolutionary disadvantage.”arrow_forwardA virophage is best descirbed as:(a) A bacteriophage that requires a helper virus(b) An animal virus that can also infect bacteria(c) A giant virus(d) A phage that is used therapeutically to treat bacterialinfections(e) A satellite virus that inhabits its helper virus (i.e., itshost virus)arrow_forwardHow many tailed bacteriophages are there, and where are they located?arrow_forward
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