LIFE:SCIENCE OF BIOL.(LL) >CUSTOM<
11th Edition
ISBN: 9781319209957
Author: Sadava
Publisher: MAC HIGHER
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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:SCIENCE OF BIOL.(LL) >CUSTOM<
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- All 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_forwardWhat 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_forward
- How is DNA testing advantageous to paternity cases? Question 27 options: a) It provides visual insight into genetically inherited differences among individuals. b) It provides insight into approximate time of conception. c) It establishes a means of stem cell transplantation for related individuals. d) It provides cloning capabilities in xenographic studies.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_forwardHow did Spiegelman et al.' s experiments in 1967 & 1970 on the origins of natural selection provide evidence for natural selection in an RNA-based world? A) The starting RNA strand was originally ~4,000 nucleotides; after several serial transfers it was reduced to ~200 nucleotides as a result of faster replication of shorter sequences being advantageous and selected for. B) The starting RNA strand was originally ~4,000; after several serial transfers and the introduction of additional RNA molecules it increased to ~20,000 nucleotides as a result of hybridization with the longer RNA molecules having outcompeted shorter RNA strands. C) The RNA remained at approximately is original sequence of ~4,000 nucleotides, demonstrating fitness in a stable environment. D) These experiments did not demonstrate natural selection.arrow_forward
- What were the initial experiments performed to determine the steps which elucidated the central dogma?arrow_forwardHow many millions of bases are in the genome of the mimivirus or largest virus known?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_forward
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