Genetic comparisons indicate that hominids and apelike ancestors diverged approximately ________ years ago
a. 4 - 5 million
b. 1.1 - 1.0 million
c. 250,000 - 280,000
d. 2.2 - 2.8 million
e. 6 - 8 million
e
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Marsupials are distinguished by:
A. a marsupium B. a marzipan C. opposable thumbs D. nails E. All of the choices provided are correct
Which neuronal structure has the greatest density of voltage-gated Na+ channels, resulting in the lowest threshold
potential along a neuron?
a. dendrites b. cell body c. axon hillock d. axon e. axon terminals
Prions cause damage to the brain by
a. causing normal proteins to change shape. b. enzymatically destroying brain cells. c. cleaving all the oxygen from that area of the brain. d. binding to bacteria in the brain and stimulating them to kill tissue. e. none of these.
Which species is the modern ancestor of modern humans?
a. Homo erectus b. Homo habilis c. Australopithecus afarensis d. Homo floresiensis
e. Neanderthals