• Suppose living organisms were to be found on Mars. How might such a fi nd shed light on the origin and evolution of life on Earth? Besides mitochondria and chloroplasts, what other kinds of entities within cells might have evolved from endosymbionts? What might be the advantages of flagellar motility for a hyperthermophile living in a thermal spring or in a black smoker vent? What would be the advantages of growth in a biofilm? Why would yeasts remain unicellular? What are the relative advantages and limitations of hyphae? Why does ruminant fermentation leave food value for the animal host? How is the animal able to obtain nourishment from waste products that the microbes could not use? • The nitrogen cycle has to be linked with the carbon cycle, since both contribute to biomass. How might the carbon cycle of an ecosystem be affected by increased input of nitrogen?

• Suppose living organisms were to be found on Mars. How might such a fi nd shed light on the origin and evolution of life on Earth? Besides mitochondria and chloroplasts, what other kinds of entities within cells might have evolved from endosymbionts? What might be the advantages of flagellar motility for a hyperthermophile living in a thermal spring or in a black smoker vent? What would be the advantages of growth in a biofilm? Why would yeasts remain unicellular? What are the relative advantages and limitations of hyphae? Why does ruminant fermentation leave food value for the animal host? How is the animal able to obtain nourishment from waste products that the microbes could not use? • The nitrogen cycle has to be linked with the carbon cycle, since both contribute to biomass. How might the carbon cycle of an ecosystem be affected by increased input of nitrogen?

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter26: Prokaryotes: Bacteria And Archaea

Section26.3: The Domain Archaea

Problem 3SB

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Question

Answer any 3 of the following questions

Suppose living organisms were to be found on Mars. How might such a fi nd shed light on the
origin and evolution of life on Earth?
• Besides mitochondria and chloroplasts, what other kinds of entities within cells might have
evolved from endosymbionts?
What might be the advantages of flagellar motility for a hyperthermophile living in a thermal
spring or in a black smoker vent? What would be the advantages of growth in a biofilm?
Why would yeasts remain unicellular? What are the relative advantages and limitations of
hyphae?
Why does ruminant fermentation leave food value for the animal host? How is the animal able
to obtain nourishment from waste products that the microbes could not use?
• The nitrogen cycle has to be linked with the carbon cycle, since both contribute to biomass.
How might the carbon cycle of an ecosystem be affected by increased input of nitrogen?

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