Plants can have ___________ defenses, which are always active, or _________ defenses, which are produced only when a plant is threatened
A. inducible; constitutive
B. constitutive; inducible
C. chemical; mechanical
D. mutualistic; symbiotic
B
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In microbial ecology studies, the FISH technique identifies organisms based on
A) the presence of green fluorescent protein. B) fluorescence of unique cofactors or pigments under certain wavelengths of UV light. C) hybridization of a fluorescent probe to specific ribosomal RNA sequences. D) the presence of luciferase.
The endocrine system functions in:
a. conduction b. contraction c. hormonal control of body functioning d. protection against disease e. cell production
In a marsh community, aquatic plankton contain 0.04 ppm of DDT, small fish contain 0.30 ppm of DDT, larger fish contain 1.5 ppm of DDT, and cormorants (fish-eating birds) contain 24 ppm of DDT. This is an example of
A. the carbon cycle. B. succession. C. nutrient cycling. D. biomagnification.
Which of the following statements about sequence proofreading during DNA replication is false?
(a) The exonuclease activity is in a different domain of the DNA polymerase. (b) The exonuclease activity cleaves DNA in the 5?-to-3? direction. (c) The DNA proofreading activity occurs concomitantly with strand elongation. (d) If an incorrect base is added, it is "unpaired" before removal.