DDT is an insecticide that kills a large spectrum of insects and causes the breakdown of reproductive fitness in birds. DDT accumulates in the food chain. Which of the four feeding guilds of birds has the highest proba-bility of extinction?
a. low in food chain and insectivore c. frugivore
b. high in food chain and insectivore d. nectarivore
A
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If blood sugar levels drop below normal, the digestive system is primarily responsible for returning levels to normal. This is an example of
A. angiogenesis. B. metastasis. C. carcinogenesis. D. homeostasis. E. digestion.
Fenestrated capillaries are unique in their ability to
A) move molecules across endothelial cells by transcytosis. B) maintain a low permeability to small water-soluble molecules. C) allow few molecules to pass between endothelial cells. D) allow relatively large molecules to pass between endothelial cells E) restrict the passage of proteins across endothelial cells.
Usually, a(n) _____ inhibitor forms a covalent bond with an amino acid side group within the active site, which prevents the substrate from entering the active site or prevents catalytic activity.
Fill in the blank(s) with the appropriate word(s).
A group of living things whose members can successfully breed with one another is called a(n) ________
Fill in the blank(s) with correct word