Plants and algae need phosphates for growth. Many fish and other animals feed on aquatic plants and algae. Why, then, is an excess of phosphates in the water (eutrophication) harmful to the organisms in a lake?
What will be an ideal response?
Responses should discuss the overgrowth of plants and the oxygen consumed by the bacteria required to break down the dead plant material, which leaves less oxygen for other organisms.
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Which of the following is most probable at a metaphase I alignment?
a. All maternal chromosomes are on the same side. b. All paternal chromosomes are on the same side. c. Each side has a mixture of maternal and paternal chromosomes. d. Each side consists of half paternal and half maternal chromosomes. e. All of these are equally probable.
Movement of glucose through the membranes of the small intestine is primarily by:
a. osmosis b. bulk flow c. active transport proteins d. diffusion through the lipid bilayer e. glucose is not absorbed in the small intestine
The first pair of walking legs in a crayfish, lobster, crab, and their relatives, that is enlarged with a terminal claw is the
a. Protopodite b. Statocyst c. Cheliped d. Pedipalp e. Exopodite
Which of the following is an example of a type I hypersensitivity reaction?
A. watery eyes after exposure to animals B. destruction of red blood cells after an incompatible blood transfusion C. farmer's lung D. immune complexes accumulation in the kidneys E. the tuberculin response