Air enters human lungs from the mouth by passing through the ________.
A. posterior air sacs
B. esophagus
C. nasal cavities
D. trachea
E. diaphragm
Answer: D
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In Bacteria, a chromosome can be distinguished from a plasmid, because a chromosome is a genetic element that
A) is circular. B) is linear. C) encodes for essential functional genes. D) replicates via a bidirectional fork.
What type of factors can trigger migration behavior in organisms?
a. seasonal weather changes b. food availability c. hormonal signals associated with maturation or reproduction d. all of these
Many aquatic invertebrates use ____ to perceive changes in their body's position and orientation
a. statocysts b. lateral line systems c. stereocilia d. saccules e. otoliths
Which of the following is false concerning
stem cells? a. They are undifferentiated cells. b. They arise from a fertilized egg. c. They can be coaxed to differentiate. d. They are obtained from a portion of a plant body. e. They may help mend damaged tissue