Why is flooding harmful to many plant species?
A. Water-logged soils have little O2.
B. Water-logged soils have little CO2.
C. Flooding reduces pH.
D. Flooding impairs the function of symbiotic
bacteria.
A
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Enzymes are
(a) biological catalysts. (b) agents that speed up cellular reactions. (c) proteins. (d) all of the above.
Eight 10-year-olds in the community became sick within a 24-hour period with vomiting and diarrhea. Personnel from the health department interviewed the children and their families, attempting to determine the source of the illness. Which piece of information below is most suggestive of the common source?
A. All eight children attended the same birthday party two days prior to becoming ill. B. Five of the eight children ride the same school bus. C. In two of the eight families, siblings were just beginning to show signs of illness at the time of the interview. D. All eight children go to the same school. E. Six of the eight children are on the same soccer team which practices three times/week.
Chemicals that are poisonous to specific cell types are said to be
a. hazardous. b. cytotoxic. c. allelochemicals. d. bioactive.
Cleavage produces a __________ stage cell. Fill in the blank(s) with the appropriate word(s)