In which trophic level is biological magnification most likely to have a deleterious impact?
1.primary producer
2.primary consumer
3.secondary consumer
4.tertiary consumer
4
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Cultures of a bacterial strain were incubated in a refrigerator (5°C), on a lab bench (22°C), in a 37°C incubator, and in a 50°C incubator. After incubation, there was no growth at 37°C and 50°C, slight growth in the refrigerator, and abundant growth on the lab bench top. Which term best describes this organism?
A. Capnophile B. Mesophile C. Halophile D. Psychrotroph E. Anaerobe
A single contraction of all the muscle fibers in a motor unit is known as ____
a. a muscle twitch b. tetanus c. summation d. relaxation coupling e. isometric contraction
You live at the base of a mountain where there is a tropical forest. As you travel up the mountain you would expect
A. the kinds of plants and animals to be similar at the base and top of the mountain. B. the forest will change into a grassland. C. to see organisms similar to those found in more northerly climates. D. to find desert.
Large proteins such as albumin remain in capillaries rather than diffusing out, resulting in the _____
A) loss of osmotic pressure in the capillaries B) development of an osmotic pressure difference across capillary walls C) loss of fluid from capillaries D) increased diffusion of carbon dioxide E) increased diffusion of hemoglobin