The response to touch by such plants as the sensitive plant is due to
A. effect of gibberellins on the area affected.
B. auxin displacement in the touched area.
C. changes in water content of cells.
D. sensitive responder cells.
Answer: C
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Which one of the following fungal groups has an alternation of multicellular gametophyte and sporophyte generations?
A. Zygomycetes B. Ascomycetes C. Blastocladiomycota D. Chytridiomycetes E. Glomeromycetes
Which statement makes a correct comparison between the regulation of an operon and controlling the
motion of a car?
a. The removal of a repressor is like stepping on the gas pedal of a car. b. The removal of a repressor is like removing your foot from the brake pedal of a car. c. The removal of a repressor is like moving your foot from the brake pedal to the gas pedal of a car. d. The removal of a repressor is like moving your foot from the gas pedal to the brake pedal of a car. e. The removal of a repressor is like removing your left foot from the brake pedal of a car while your right foot remains on the gas pedal.
For E. coli cells, the sugar lactose acts as an inducer. In general, an inducer:
A: binds to the promoter and prevents the repressor from binding to the operator. B: stimulates the synthesis of the needed enzyme(s). C: binds to the operator and prevents the repressor from binding at this site. D: inhibits the synthesis of the needed enzyme(s). E: is the same as a promoter.
Which of the following processes is not an agent of microevolution?
A) polygenic inheritance B) natural selection C) gene flow D) mutation E) genetic drift