About ________ percent of the human genome sequence comes from retroviruses.
A) 4
B) 8
C) 12
D) 21
B) 8
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Those organisms that remain planktonic for their whole lives are called:
a. meroplankton. b. holoplankton. c. nanoplankton. d. seston. e. nekton.
Which has the strongest effect on whether stomata are open or closed?
a. sunlight b. ion concentrations in the xylem c. CO2 concentration d. O2 concentration e. abscisic acid
Curtis and McIntosh created a scale of an environmental gradient based on changes in physical characteristics or community composition along that gradient. What term did they apply to this index?
A) the climax index B) the continuum index C) the successional index D) the tolerance index
In order to work best, enzymes ____.
A. always need coenzymes B. randomly grab surrounding molecules C. need low pH D. need high temperatures E. need set environmental conditions, specific for each enzyme