Carl Woese has controversially proposed that all three domains of life evolved from a(n) ________
A) single last unique common ancestor (LUCA)
B) extremophilic archaean
C) fusion of a bacterium with an archaean
D) universal gene-exchange pool
E) very large virus
D
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An action potential is propagated down an unmyelinated neuron plasma membrane because
a. the action potential stimulates voltage-gated Na+ channels adjacent to it. b. the action potential stimulates voltage-gated Ca2+ channels adjacent to it. c. the action potential stimulates voltage-gated K+ channels adjacent to it. d. the action potential stimulates voltage-gated Na+ and Ca2+ channels adjacent to it. e. the action potential stimulates voltage-gated k+ and Ca2+ channels adjacent to it.
How does a pluripotent cell differ from a unipotent or totipotent cell? What will be an ideal response?
Mot-mots are snake-eating birds of the American tropics. If a mot-mot killed and consumed a rattlesnake and that snake fed upon grain-eating rodents, then how many kilograms of grain would normally be required to end up with 1 kg of mot-mot?
A) 10 B) 100 C) 1000 D) 10,000
Place each of the following terms with the correct statement.coevolutiondefensive colorationcamouflagesecondary chemical compoundsBatesian mimicryChemical compounds produced by plants that are not components of major metabolic pathways.
What will be an ideal response?