What is the difference between R and K selective? Provide anexample of a K specialist species and an R specialist species. Whatkind of environment would favor each and why?

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Keith LeannonLv2

29 Sep 2019

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The broad-leafed cattail (Typha latifolia) is found inabundance in freshwater habitats, and the narrow-leafed cattail(Typha angustifolia) is commonly restricted to more salinehabitats. Two alternative hypotheses have been proposed to accountfor these patterns of distribution. The first hypothesis is thatT. latifolia is a specialist in freshwater habitats andT. angustifolia is a specialist in saline habitats. Theother hypothesis is that T. latifolia is a specialist infreshwater habitats, but T. angustifolia is a generalistand could exploit freshwater habitats, but is prevented from doingso due to competition from T. latifolia. Describe thestudy you would design to distinguish between these twohypotheses.

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Pre-Laboratory Questions

1. Why do bacterial cultures need to be incubated, usually for at least 24 hours, before we can see evidence of bacterial growth that can be observed with the unaided eye?

2. In what ways are the media used in this investigation selective?

3. In what ways are the media used in this investigation differential?

4. Consider a mixture of bacterial species from the same genus, such as Staphylococcus. Some members of this genus are harmful pathogens, while others are not. Would a selective medium alone be a good tool to separate the harmful species from the non-harmful species? Explain your answer.

Post-Lab Questions

1. Would simply adding a pH indicator like phenol red to a general-purpose medium, such as nutrient agar, result in a medium that is selective, differential, both, or neither? Why or why not?

2. Why were you instructed to inoculate each plate with three separate streaks, one of each bacterial species, instead of combining all three species and streaking them all onto the plate together?

3. Blood agar and chocolate agar are commonly-used media in many clinical and research laboratories. Why do you think they were not included in your kit?

4. Were there any discrepancies between what you saw in your experiment and what you expected to see based on the lab manual and your readings in this section?

1. Give anexample of activity-dependent changes in the adult primatecortex.

2. In mammalswhat are the differences between the CNS and PNS that make PNSneurons more efficient at axon regeneration?

3. Give anexample of an extrinsic factor that prevents mammalian CNS nerveregeneration.

Please provide a good answer.