What is the risk associated with the use of biological controls in pest management?
A. pollution caused by chemical pesticides
B. loss of pollinating animal species
C. the possibility of the biocontrol species becoming invasive
D. the evolution of pesticide resistence
E. All of the above are risks associated with the use of biological controls.
Ans: C. the possibility of the biocontrol species becoming invasive
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In the late 1960's, Robert Paine conducted landmark studies on diversity in the rocky intertidal zone comparing the species diversity in control plots with diversity in experimental plots from which he removed the top predator, sea stars
After 5 years, 15 species of intertidal invertebrates lived in the control plots, while the experimental plots were dominated by only two species, one mussel and one barnacle. Why did species diversity most likely remain high in the presence of a predator? A. The sea star kept the mussel and barnacle populations low enough to prevent competitive exclusion from occurring. B. The sea star kept the mussel and barnacles from developing a mutualistic relationship. That, in turn, kept their populations low. C. The mussel and the barnacle parasitized the sea star, keeping populations low enough to prevent competitive exclusion from occurring. D. The sea star developed a mutalistic relationship with the mussel and barnacle, keeping their populations low and preventing competitive exclusion from happening.
Southern blotting is a process where __________ is transferred from a gel to a __________ where a
probe can be applied. a. DNA; water solution b. protein; water solution c. DNA; nitrocellulose filter d. RNA; nitrocellulose filter e. protein; nitrocellulose filter
Once an amino acid has been attached to the appropriate tRNA, the tRNA is called a(n) ________, and the amino acid is said to be ________
Fill in the blank with correct word.
Programmed cell death is known as
A. meiosis. B. autophagy. C. cell genesis. D. apoptosis. E. mitosis.