In general, species richness follows a longitudinal gradient
Indicate whether the statement is true or false.
ANS: F, latitudinal
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The genetic variation that exists among humans is mainly due to the differences that exist within their ________
a. alleles b. ribosomes c. parents d. cell membranes e. cells
During contraction,
a. cross-bridges of muscle filaments are broken and reformed. b. ATP is used to break cross-bridges. c. muscle cells use glucose derived from glycogen as an energy source. d. glycogen depletion may lead to muscle fatigue. e. all of these occur.
The countercurrent exchange system found in fish gills maximizes gas exchange efficiency by:
a. producing rapid water flows across the gill surface. b. allowing water and blood to come in direct contact to maximize oxygen exchange. c. having the most oxygen-depleted blood come in contact with the most oxygen-rich water. d. having the most oxygen-depleted blood come in contact with the most oxygen-depleted water. e. decreasing the oxygen content of the blood leaving the gill filaments
Modern pregnancy tests use ________ antibodies produced against a pregnancy hormone as the antigen.
Fill in the blank(s) with the appropriate word(s).