The presynaptic neuron may decrease the output of a neurotransmitter after being told to do so by ionotropic receptors.
a. True
b. False
a. True (Most neurotransmitters act on one of two receptors: ionotropic or metabotropic. An ionotropic receptor contains a pore that can be opened or closed to regulate the flow of ions through it, thereby producing voltage changes on the cell membrane.)
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Food chains are sometimes short because _____
A) only a single species of herbivore feeds on each plant species B) local extinction of a species causes extinction of the other species in its food chain C) most of the energy in a trophic level is lost as it passes to the next higher level D) predator species tend to be less diverse and less abundant than prey species E) most producers are inedible
An environmental testing laboratory is unable to identify a single-celled organism isolated from a well water sample. Inspection of the microorganism with a compound microscope reveals that it uses pseudopodia for movement and is not enclosed within a mineral shell. Based on this information, this organism can be classified to which supergroup?
A. Opisthokonta B. Alveolata C. Amoebozoa D. Rhizaria E. Excavata
In mammalian females, which of the following is NOT essential for reproduction?
a. ovary b. oviduct c. uterus d. vagina e. urethra
________ allows fish to camouflage themselves to avoid predators or ambush prey
a. Obliterative countershading b. Disruptive coloration c. Aposematic coloration d. Cryptic coloration