After forest harvest in an old-growth forest of the Oregon Cascades, an ecologist noted that the species that were present after 5 years differed from the species that were present 25 years later, and these differed from the species that were present
75 years later. What are the general characteristics of the species at each stage, and why does the community change over time?
This is an example of secondary succession. The first species to colonize the cleared site are generally fast-growing, easily dispersed, weedy species that are intolerant of shade. Fast-growing tree species eventually replace these weeds, and these in turn are replaced by shade-tolerant, slow-growing tree species that can outcompete the other species to form a relatively stable climax community.
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Archaea and bacteria are involved in which of the following cycles? (Select all correct choices.)
A. the nitrogen cycle B. the carbon cycle C. the sulfur cycle
Monoglycerides and fatty acids diffuse into a brush border cell, where they form triglycerides and combine with
proteins to form __________. Fill in the blank(s) with the appropriate word(s).
Protein in the plasma membrane that combines with and transports a molecule or ion across the plasma membrane.
What will be an ideal response?
You are presented with an organism that has not been identified previously. Which feature would identify it as a fungus?
A. nonparasitic B. flagella C. cell wall D. absorptive nutrition E. mycelia