What is a buffer?
A. A substance that releases hydrogen ions in water
B. A substance that accepts hydrogen ions in water
C. A substance that accepts oxygen ions in water
D. A set of chemicals that keep the pH of a solution stable
E. A substance that releases oxygen ions in water
Answer: D
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The critical tissue for producing a vasodilatory effect of acetylcholine in Robert Furchgott's experiments with rabbit aortas was the
A. endothelium. B. smooth muscle layer. C. elastic outer layer. D. pericardium. E. one-way valves.
The scientific name for Neanderthals is
A) Homo sapiens. B) Homo habilis. C) Australopithecus robustus. D) Homo erectus. E) Homo neanderthalensis.
Which of the following biomes is characterized by rich soils, insufficient rainfall for trees, and many herbivores?
A. chaparral B. taiga C. desert D. tundra E. grasslands
A consequence of the linear probability model always having heteroscedastic errors will be which of the following?
A. The intercept will be negative. B. The coefficient estimates will be biased. C. The R-squared measure will be above 1. D. None of the answers is correct.