Based on the fossil record, ____ evolved about 1.8 million years ago and made fairly sophisticated tools, including the
hand axe.
a. Homo habilis
b. Homo erectus
c. Australopithecus africanus
d. Australopithecus afarensis
e. Homo neanderthalensis
ANSWER: b
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The differences in relative concentrations of ions inside and outside the cell act as an electrical force. The specific ion(s) MOST important to establishing the resting potential in neurons would be
A. Na+. B. K+. C. intracellular anions (e.g., proteins). D. H+. E. Na+, K+ and intracellular anions are all important.
The group of animals with an efficient respiratory system, in that there is no "stale air" after exhalation, is the:
a. amphibians b. birds c. mammals d. reptiles e. fish
The thymus plays an important role in ____
a. secretion of thyroxine b. immune function c. adrenal function d. production of testosterone e. sleep-wake cycles
According to Bridges's proposal, exceptional phenotypes and unusual karyotypes were the result of rare mistakes in meiosis caused by the failure of X chromosomes to separate properly in either the first or second meiotic division in females
What term is used in referring to this phenomenon?