The water-vascular system is used primarily for
a. excretion of excess water.
b. locomotion.
c. respiration.
d. circulation.
e. sensing the environment.
Answer: b
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Age of onset for schizophrenia is
A) prenatal. B) birth. C) early childhood. D) early adulthood.
Which group is characterized by radially symmetrical members?
a. arthropods b. cnidarians c. flatworms d. mollusks e. annelids
Cilia and flagella of eukaryotic cells are composed of:
A. nine triplets of microtubules in a circle. B. actin filaments in a 9 + 2 arrangement. C. protein fibers in a helical arrangement. D. microtubules in a 9 + 2 arrangement.
Which of the following contribute to the ability of archaea to survive in extreme environments?
A) branched hydrocarbons with ether linkages B) phospholipids with monounsaturated fatty acids C) hopanoids D) glycerols E) both hopanoids and glycerols