Biology: Life on Earth (11th Edition)
11th Edition
ISBN: 9780134256283
Author: Audesirk
Publisher: PEARSON
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Textbook Question
Chapter 20, Problem 2AC
Before the discovery of prions, many (perhaps most) biologists would have agreed with the statement “It is a fact that no infectious organism or particle can exist that lacks
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Chapter 20 Solutions
Biology: Life on Earth (11th Edition)
Ch. 20 - The name of the process by which DNA is...Ch. 20 - Prob. 2MCCh. 20 - Prob. 3MCCh. 20 - 4. Viruses
a. are usually...Ch. 20 - Prob. 5MCCh. 20 - _______have peptidoglycan in their _____, but____...Ch. 20 - Prob. 2FTBCh. 20 - 3. Many prokaryotes use _____ to move about. Some...Ch. 20 - _____ bacteria inhabit environments that lack...Ch. 20 - 5. Prokaryotes reproduce by _____and may sometimes...
Ch. 20 - 6. The plant nutrient ammonium is produced by___...Ch. 20 - Prob. 7FTBCh. 20 - A virus consists of a molecule of ____or _____...Ch. 20 - Describe some of the ways in which prokaryotes...Ch. 20 - What are nitrogen-fixing bacteria, and what role...Ch. 20 - Describe some of the extreme environments in which...Ch. 20 - Prob. 4RQCh. 20 - What is conjugation? What role do plasmids play in...Ch. 20 - 6. Why are prokaryotes especially useful in...Ch. 20 - Describe the structure of a typical virus. How do...Ch. 20 - Describe some examples of how prokaryotes are...Ch. 20 - How do archaea and bacteria differ? How do...Ch. 20 - Prob. 1ACCh. 20 - Before the discovery of prions, many (perhaps...
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- ________ can have a genome of either RNA or DNA. a. Bacteria b. Eukaryotes c. Viruses d. Archaeaarrow_forwardWhat is life? Why are viruses not considered alive? What other things can you think of that are not alive but might be almost alive?arrow_forwardIf a person contracted MRSA and no antibiotics are working on them, how would you go about finding a way to treat their infection? Describe, in detail, how you would devise a plan to save their life utilizing your knowledge of bacteria and viruses.arrow_forward
- How does the emergence of endosymbiotic theory change the way humans view microorganisms? Will people be comfortable imagining that the life functions of plants and animals, including their own, are actually dependent on the coexistence of many different microscopic pieces? This question is not answered yetarrow_forwardMany pathogenic bacteria are unable to make some of the metabolic compounds needed for growth and have instead evolved enzymes that enable the bacteria to actually invade human body cells. What do these bacteria expect to accomplish by this practice?arrow_forwardWhich of the following statements concerning viruses and human health is false? a-in many diseases caused by viruses, the virus attacks cells as it reproduces b- many viral diseases can be controlled through vaccinations c- some viruses can remain dormant in the body for years before disease symptoms appear d-most viral infections are difficult to treat, but they can be finally destroyed by antibioticsarrow_forward
- A recent study found that 480 Streptomyces strains freshly isolated from the soil are resistant to at least six different antibiotics. In fact, some isolates are resistant to 20 different antibiotic drugs.Why do you think these bacteria (which are neither pathogenic nor exposed to human use of antibiotics) are resistant to so many drugs? What might be the implications for human bacterial pathogens?arrow_forwardWhich of these statements is true? a. An antibiotic is any substance produced by a organism that is antagonistic to the growth of prokaryotes. b. An antibiotic is any substance produced by a prokaryote that is antagonistic to the growth of other viruses. c. An antibiotic is any substance produced by a prokaryote that is antagonistic to the growth of eukaryotic cells. d. An antibiotic is any substance produced by a prokaryote that prevents growth of the same prokaryote.arrow_forwardSome people feel that viruses are living organisms. Give an explanation as to why they cannot be considered living at this time.arrow_forward
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