What characteristics separate the Class Mammalia from other animals in the phylum Chordata?
A. bipedal locomotion and an upright stance
B. being heterotrophic and multicellular
C. developed brain and tool use
D. dorsal tubular nerve cords and notochords
E. vertebrates with hair and mammary glands
Answer: E
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A drawback of the biological species concept is that it cannot be applied to:
A. extinct organisms (e.g., fossils). B. asexual organisms such as bacteria. C. polymorphic species. D. extinct and asexual organisms. E. all of the answer options are correct.
When cells stop responding to normal controls over growth and division they
a. begin to form a tumor. b. produce a malignancy. c. start to die. d. kill surrounding cells. e. produce scar tissue.
At any temperature, the metabolic rates of endotherms are always higher than those of ectotherms of comparable size
1.True 2.False
A telephone rings and a girl responds by turning her head toward the noise. How did the girl's body know to respond?
a) motor neurons in the girl's brain interpreted the sound as a ringing telephone b) interneurons in the girl's neck communicated with her muscle cells to turn her head c) none of the other answer choices d) sensory neurons in the girl's ears detected the stimuli of the telephone ringing