The two distinct types of neurotransmitter receptors found in postsynaptic membranes are
A. metabotropic and neurotropic.
B. ionotropic and gonadotropic.
C. gonadotropic and neurotropic.
D. neurotropic and isotopic.
E. metabotropic and ionotropic.
E. metabotropic and ionotropic.
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What is the function of pine resins?
A. transportation of sucrose to the roots B. reduction of fungal and insect parasitism C. triggering of seed maturation D. aiding in pollen dispersal
Helena received a pea plant from her neighbor, and she wants to know its genotype. The neighbor told Helena that the plant produces round peas, which is a dominant trait (R) to wrinkled peas (r). Helena performs a test cross and observes that half of the offspring plants produce wrinkled peas. What is the genotype of the plant Helena received from her neighbor?
a. homozygous recessive, rr b. heterozygous, Rr c. heterozygous, RR d. homozygous dominant, RR
In a lake, a certain native species of zooplankton is found evenly distributed in the water column. After introduction of
a different species of zooplankton, the native species is only found in the shallow water zone. This is most likely an illustration of: a. character displacement. b. species richness. c. primary succession. d. secondary succession. e. competitive exclusion.
In the Gulf of Mexico, red tides caused by the dinoflagellate Karenia brevis cause massive fish kills as well as respiratory problems in humans. As an environmental scientist, what would you suggest concerned citizens do to help prevent these red tides?
A. Encourage sustainable fishing B. Participate in beach cleanup efforts C. Purchase fuel-efficient vehicles D. Reduce fertilizer use on lawns and gardens E. Decrease the amount of artificial light in coastal areas