Why is the African elephant considered a keystone species?
A) Elephant populations are larger than the populations of any other organisms in their community.
B) The removal of elephants from their community would result in drastic changes in the ecological structure of the community.
C) Elephants live in large cooperative herds that dominate other smaller groups within the community.
D) Elephants eat more food than any other species in their community.
E) It is the largest organism in its community.
B
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Sexual reproduction in algae utilizes meiosis that results in the production of
A. spores with twice as much DNA as the parental cells. B. gametes with half the amount of DNA as in the parental cells. C. spores with the same amount of DNA as the parental cells. D. swarming cells with the same amount of DNA as the parental cells.
Disruption of neural signaling can produce profound changes in mood and behavior. Cocaine exerts its effects by
A. blocking norepinephrine and dopamine reuptake from synapses. B. blocking serotonin reuptake from synapses. C. preventing neurotransmitter vesicle fusion with presynaptic neuron membranes. D. blocking the enzyme acetylcholinesterase. E. binding to the GABA receptor to enhance inhibitory neurotransmission.
People who have type 1 diabetes cannot make _____ and must inject it
Fill in the blank(s) with correct word
Molecular techniques led to the reinterpretation of morphologically based phylogeny such that
A. echinoderms and chordates were placed in entirely different clades. B. rotifers and nematodes were designated as closely related. C. annelids and arthropods were designated as closely related. D. Bilateria was designated as a monophyletic group. E. Ecdysozoa and Lophotrochozoa were designated as clades.