A reaction of a strong acid and a strong base will produce water and
a. a buffer.
b. a salt.
c. gas.
d. solid precipitate.
e. solute.
B
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The appearance of complex multicellular animals in the fossil record:
A. coincides with increased levels of oxygen in the atmosphere and ocean. B. occurred at about the same time as the appearance of land plants. C. occurred soon after the appearance of simple multicellular organisms. D. occurred after the appearance of complex multicellular fungi. E. coincides with time period when oxygen first began to accumulate in the atmosphere.
Which of the following are components of vertebrate gravity receptors?
I-Utricle and saccule chambers of a membranous labyrinth. II-Hair cells with stereocilia and kinocilium. III-Hairlike processes embedded with otolith membrane, a gelatinous membrane containing calcium carbonate crystals. IV-Peripheral chemoreceptors. A. I and II only B. II, III, and IV C. I and IV only D. I, II, and IV E. I, II, and III
Steroid hormones are synthesized from:
a. amino acids b. peptides c. proteins d. cholesterol e. fatty acids
A benign tumor is a condition in which tumor cells _______.
A. have an unusual number of chromosomes B. remain confined to their original site C. migrate from the initial site of transformation to other organs or tissues D. invade the circulatory system