Addition of a primary carnivore to an ecosystem can sometimes influence the whole ecosystem. This process is called 

A. ecosystem stabilization.
B. a bottom-up effect.
C. species turnover.
D. disruption.
E. a trophic cascade.


E. a trophic cascade.

Biology & Microbiology

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The point of constriction on chromosomes that contains certain repeated DNA sequences that bind specific proteins is called:  

A.  The kinetochore B.  The centromere C.  The cohesin complex D.  The centriole E.  The centrosome

Biology & Microbiology

Which of the following is/are used to identify methicillin-resistant Staphylococcus aureus?

A) selective media B) differential media C) PCR D) selective media, differential media, and PCR

Biology & Microbiology

A commercial fisherman is very concerned that overfishing will result in a decrease in tuna population size, thus affecting his catches in future years. What strategy can he employ to make sure that the tuna population can be sustained in the long term?

A. He can only catch young, non-reproducing fish. B. He can only catch old fish (past the reproductive age). C. He can only catch fish at the reproductive age.

Biology & Microbiology

Echinoderms often have an important ecological effect on their environment. Provide at least 2 examples of their effects in particular locations

What will be an ideal response?

Biology & Microbiology