The most widely used herbicide in the world, 2,4-D, is a synthetic form of
a. abscisic acid.
b. ethylene.
c. salicylic acid.
d. gibberellin.
e. auxin.
E
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If a special fungicide killed all of the glomeromycetes in an environment, but did not affect other types of fungi, which of the following would most likely occur?
A. Plant nutrient uptake from the soil would be reduced. B. Overall decomposition rates would be dramatically reduced. C. Mushrooms would be absent from the environment. D. Lichens would be absent from the environment. E. Aquatic habitats would completely lack fungi.
The hominoids arose during the:a
Miocene epoch. b. Eocene epoch. c. Pleistocene epoch. d. Holocene epoch. e. Pliocene epoch.
If the neuron is stimulated such that its membrane potential changes to 50 mV, what is the sign of the driving force for Cl- ions and in which direction will these ions move across the membrane?
a. Positive driving force; Cl- moves into the cell b. Positive driving force; Cl- moves out of the cell c. Negative driving force; Cl- moves into the cell d. Negative driving force; Cl- moves out of the cell.
The human knee-jerk reflex requires an intact _____
A) spinal cord B) corpus callosum C) cerebellum D) medulla