When a neuron responds to a particular neurotransmitter by opening gated ion channels, the neurotransmitter is serving as which part of the signal pathway?
A) relay molecule
B) transducer
C) signal molecule
D) response molecule
C
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A confused frog deposits its sperm onto a toad's eggs as they are being laid. No offspring develop because the frog's sperm are unable to penetrate the toad's egg. This is an example of
A. mechanical isolation. B. temporal isolation. C. habitat isolation. D. behavioral isolation. E. gametic isolation.
Which type of virus causes polio and AIDS?
A) retrovirus B) reovirus C) bacteriophage D) adenovirus E) parvovirus
Equilibrial species are shaped by ____, and tend to have a ____
a. K-selection; small body and short generation time b. r-selection; large body and long generation time c. K-selection; large body and long generation time d. r-selection; small body and long generation time
e. r-selection; large body and short generation timeThe rate of production of new biomass by heterotrophs is called
A. primary productivity. B. gross productivity. C. net productivity. D. secondary productivity. E. consumer productivity.