Systems in which feedback from changes in one direction elicit compensatory effects in the opposite direction.
What will be an ideal response?
Negative feedback systems
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Some species of ants "farm" aphids by protecting them from predators. In return, the ants feed on a sugar-rich liquid (called honeydew) secreted by the aphids. The ecological relationship between the ants and the aphids is:
A. mutualism. B. parasitism. C. competition. D. None of answers is correct.
The clustered, regularly interspaced short palindromic repeats (CRISPR) system in bacterial cells has been called the "immune" system of bacteria. CRISPR protect bacteria from a repeat infection from the same phage because bacterial cells
A. recognize proteins on the surface of the phage and secrete enzymes that digest the phage. B. recognize proteins on the surface of the phage and secrete proteins that block the binding of the phage. C. integrate fragments from the phage DNA in their own chromosomes and target for destruction any DNA that contains the same fragments in the future. D. modify the attachment sites for the phages so that new infections cannot take place.
Hawaiian fruit flies provide an example of which of the following?
a. founder effects b. genetic drift c. adaptive radiation d. founder effects and genetic drift e. founder effects, genetic drift and adaptive radiation
M. J. Berkeley demonstrated that the great potato blight of Ireland was caused by a fungus.
Answer the following statement true (T) or false (F)