Explain how a bacterium living in a biofilm behaves very similar to a primitive multicellular organism
What will be an ideal response?
Bacteria living in a community or biofilm produces chemicals called autoinducers. Bacteria are able to use these signals to better sense what is occurring in their community and this is referred to as quorum sensing. Quorum sensing allows bacteria to alter their protein synthesis in response to changes in the density of the population. In this way, quorum sensing allows unicellular organisms to coordinate their processes and behave more collectively, almost like a primitive multicellular organism.
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Some plants have cultivated a symbiotic relationship with soil bacteria capable of fixing atmospheric nitrogen. Why do plants need nitrogen?
a. to build lipids important in membranes and energy storage b. to make the saccharides used to build their cellulose cell walls c. to synthesize amino acids that are used to form proteins d. nitrogen is an important energy source to plants that cannot harvest sunlight
Why is it important to learn about rabies when only a few cases occur in the United States each year?
A. The US isn't the entire world. Rabies might be more common in other areas, and it's important to understand due to its lethality. B. The only reason why rabies isn't common in the US is due to our lack of interaction with animal carriers. We could very easily have an outbreak on our hands if we don't know the warning signs to watch for that we've learned about by studying the virus and disease. C. Rabies can never be completely eliminated-it has too many different animal reservoirs/carriers. As such, we need to remain constantly aware of how to protect human populations, both by preventing and treating the illness. We can only do that by learning about it. D. All of the above are correct.
Arrange the following entries in the order in which air contacts them as air is drawn into the body. a. trachea b. bronchiole c. pharynx d. alveoli e. larynx
A) e, c, b, a, d B) c, a, e, d, b C) b, d, a, c, e D) c, a, e, b, d E) c, e, a, b, d
Sexual selection:a
is the basis for establishing elaborate societies. b. leads to a reproductive advantage for some individuals over others of the same sex and species. c. favors monogamous mating systems. d. leads to the investment of parental care of offspring. e. is not a type of natural selection.