________ muscle is the type of muscle primarily responsible for stomach contractions.
A. cardiac
B. smooth
C. skeletal
Answer: B. smooth
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Receptors for polar molecules are found ____, while receptors for nonpolar molecules are located ____
a. on the cell surface; within the cell b. within the cell; on the cell surface c. on the cell surface; on the nuclear membrane d. on the nuclear membrane; on the cell surface e. on the cell surface; within the lipid bilayer
Which young develop briefly in their mother's body, nourished by egg yolk and by nutrients that diffuse from the mother's tissues?
a. nonbird reptiles b. birds c. monotremes d. marsupials e. placentals
Which of the following is NOT true regarding an
incomplete digestive system? a. Food enters a saclike gut. b. Food and wastes pass through the same opening. c. Food is only partially digested in this system; therefore, fecal material is good fertilizer. d. This system favors regional specialization. e. There is two-way traffic of materials in this system.
Bryophytes have all of the following characteristics except
A) multicellularity. B) specialized cells and tissues. C) lignified vascular tissue. D) walled spores in sporangia. E) a reduced, dependent sporophyte.