What structural feature allows land animals to
exchange gases?
a. gills
b. moist skin
c. digestive system
d. lungs
e. nasal passage
D
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What types of synaptic inputs can postsynaptic nerve cells receive?
A. excitatory B. inhibitory C. both D. neither
Which of the following persons is MOST likely to experience chronic stress?
A. Zachary's father died of a heart attack three weeks ago. B. Junko has been in labor for 10 hours so far. C. Wen-Ho is stuck on a Los Angeles freeway at rush hour while visiting his aunt for the week. D. Paulette is shy and attending a new high school.
Which of the following is the best explanation for the inability of a specific animal cell to reduce the Ca2+ concentration in its cytosol compared with the extracellular fluid?
A) blockage of the synaptic signal B) loss of transcription factors C) insufficient ATP levels in the cytosol D) low levels of protein kinase in the cell
The cow Bos primigenius (which is bred for meat and milk) has a smaller brain and larger eyes than closely related wild species of ungulates. These traits most likely arose by _____
A) natural selection, because these traits evolved in the population over time B) natural selection, because these traits were not consciously selected by humans C) artificial selection, because changes in these traits co-occurred with human selection for high milk output and high muscle content D) artificial selection, because these animals differ from their close relatives and common ancestor