Which of the following is an example of feeding behavior that has a high energy intake to effort ratio?
a) human children eating dirt
b) crabs eating mussels that are intermediate in size
c) geese retrieving the largest egg-like object near their nests
d) a monkey reaching over a snake to get a peanut
e) vampire bats sharing blood meals with non-relatives
Ans: b) crabs eating mussels that are intermediate in size
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During osmosis, water will move from a ____concentration of water to a ___ concentration of water.
a. low; high b. high; low c. high; equilibrium d. low; equilibrium
Under the conditions known as El Niño, the inorganic nutrient content of the seawater off the coast of Peru declines to very low levels. What effect will this likely have on marine life in the area?
A) The lower the levels of minerals, the less polluted the water; hence, most populations will increase. B) It will result in toxic red tides, which will reduce the populations of many species. C) It will reduce the abundance of phytoplankton and, consequently, the abundance of other organisms. D) It will increase the productivity of phytoplankton and, therefore, the productivity of other organisms by allowing sunlight to penetrate deeper into the ocean.
Discuss the similarities and differences between immunodiffusion and immunochromatographic assays
What will be an ideal response?
All of the following pertain to HIV, except
A. it attaches primarily to host cells with CD4 receptors. B. the viral DNA integrates into the host nucleus. C. it can enter into nervous tissues and cause abnormalities. D. it causes Kaposi sarcoma. E. it has reverse transcriptase.