Becker's World of the Cell (9th Edition)
9th Edition
ISBN: 9780321934925
Author: Jeff Hardin, Gregory Paul Bertoni
Publisher: PEARSON
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Chapter 4, Problem 4.9PS
Are They Alive? Biologists sometimes debate whether viruses should be considered alive. Let’s join in the debate.
- (a) What are some ways in which viruses resemble cells?
- (b) What are some ways in which viruses differ from cells?
- (c) Choose either of the two following positions and defend it: (1) Viruses are alive. (2) Viruses are not alive.
- (d) Why do you suppose that viral illnesses are more difficult to treat than bacterial illnesses?
- (e) Design a strategy to cure a viral disease without harming the patient.
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Chapter 4 Solutions
Becker's World of the Cell (9th Edition)
Ch. 4 - Why do scientists currently believe that RNA,...Ch. 4 - You have discovered a new organism living in...Ch. 4 - If a scientist were studying a disease in which...Ch. 4 - Imagine that you are building an artificial...Ch. 4 - If viruses are nonliving particles, how can they...Ch. 4 - Wrong Again. For each of the following false...Ch. 4 - Prob. 4.2PSCh. 4 - Toward an Artificial Cell. Scientists have...Ch. 4 - Sentence Completion. Complete each of the...Ch. 4 - Telling Them Apart. Suggest a way to distinguish...
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- RNA viruses require their own supply of certain enzymes because(A) host cells rapidly destroy the viruses.(B) host cells lack enzymes that can replicate the viral genome.(C) these enzymes translate viral mRNA into proteins.(D) these enzymes penetrate host cell membranes.arrow_forwardYou are studying a new retrovirus. The viral protein (X) appears to play a role in the export of the viral genomes to the cytoplasm. Protein X brings viral DNA to the cytoplasm and returns back to the nucleus after genome export is complete. Researchers have developed a new drug for the virus. Following treatment with the new drug, the viral protein stays in the nucleus and cannot export the viral genomes. What is the most plausible and logical function of the drug? Use your knowledge of nuclear transport to answer this question. O A. The drug inhibits the binding of the viral protein and the viral genomes to the import receptor. B. The drug inhibits the binding of Ran-GTP to the nuclear export receptor in nucleus. C. The drug promotes the Ran GAP activity. D. The drug blocks the NLS on the viral protein.arrow_forwardThe genome of which of the following types of animal virus can act directly as MRNA and be utilized by ribosomes without prior processing? O 1) retroviruses O 2) SSDNA viruses 3) -SSRNA viruses O 4) +SSRNA viruses 5) dsDNA virusesarrow_forward
- A particular animal virus requires the use of DNA polymerase from its host, since it does not possess its own DNA polymerase enzyme. Which of the following assumptions in A-D would likely be correct regarding this virus? A) O This virus could not be a retrovirus type. B) OIt could be a (-) ss RNA virus. C) O It could be a (+) ss RNA virus. D) O The vVirus life cycle very likely includes going to the host cell nucleus. E) O All ofA-D are correct assumptions.arrow_forwardStudent J and K were arguing about viruses and bacteria. Student K said that it would be easy to tell viruses and bacteria apart by just growing them in a lab and looking at them under a microscope. Student J said there were major flaws in that idea. What are the flaws in Student K’s idea?arrow_forward(a) Give any two differences between DNA and RNA. (b) What is recombinant DNA? Give two beneficial proteins produced from recombinant DNA technology. (c) How do nucleoside analogs disrupt life cycle of HIV-1 virus?arrow_forward
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- When Wimmer and coworkers announced that they had synthesized the poliovirus, they created considerable controversy. Some people feared that deadly and highly contagious viruses might be synthesized by bioterrorists. The researchers responded that they were merely applying current knowledge and techniques to demonstrate the principle that viruses are basically chemical entities that can be synthesized in the laboratory. Do you think scientists should synthesize viruses or other agents that can cause infectious disease? What are the implications of forbidding such research?arrow_forward10) One of the field of studies listed includes the rest: a) Viral Nucleic acids type b) Viral classification c) Capsid symmetry d) Presence of an envelope e) Absence of an envelope. 11) The cells that line our respiratory tract, and one celled paramecium both have cell membrane modifications called: a) flagella b) microfilaments c) centrioles d) cilia e) pili. 12) A proteasome degrades proteins that are “tagged” with: a) Phosphates b) Ubiquitin c) Methionine d) CoQ enzyme e) Poly A tailarrow_forwardAre viruses living? Why or why not?arrow_forward
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