What is the osmolarity of fresh water?
a. about 5 mOsm/L
b. about 225 mOsm/L
c. about 300 mOsm/L
d. about 1500 mOsm/L
Answer: a. about 5 mOsm/L
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Hypothetically, how could scientists lower Earth's temperature in order to combat global warming?
A) by moving ice from the Arctic to the tropical oceans B) by forcibly melting more glaciers and polar ice caps C) by reflecting more light from land masses D) by decreasing the reflectance of cities
Select all of the following that represent examples of taxis.
A. Mammalian spermatozoa are guided toward an oocyte by a temperature gradient between the cooler sperm storage site and the fertilization site. B. In the Northern Hemisphere, Aquaspirillum bacteria burrow towards the magnetic north pole (the geographical south pole). C. Human body lice change direction more frequently as the temperature of their immediate environment increases. D. Cyanobacteria filaments in an intertidal environment migrate upward if salinity falls below 15% and downward if it rises above 15%.
The net movement of molecules from a high concentration to a low concentration is best described by which of the following?
A) Endocytosis B) Exocytosis C) Osmosis D) Active transport E) Passive transport
The following pedigree is showing the inheritance of a Y-linked disorder. What is the genotype of the 2nd born offspring (son) in generation III?
a) homozygous dominant b) homozygous recessive c) heterozygous d) hemizygous