In flatworms, the action of ciliated __________ draws interstitial fluid into a system of tubes that
delivers it to the body surface. Fill in the blank(s) with the appropriate word(s).
flame cells
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Gram stain is used to distinguish between different
(a) bacteria. (b) protistans. (c) dinoflagellates. (d) all of the above.
Honeybees must maintain specific temperatures to thrive. On hot days, the hive can quickly
overheat, so some bees will stand near the entrance and fan their wings to provide cool air currents into the hive. In winter, honeybees cluster together in their hives and vibrate their wings in a form of shivering to generate heat and maintain the hive at a constant temperature. This heating and cooling is a form of
a. homeostasis. b. evolution. c. competition. d. homology
Why do people tend to get shorter as they age?
a. they hunch over due to fatigue b. their bones become shorter c. their muscles become shorter d. the intervertebral disks deteriorate e. the vertebral height diminishes
In a direct ELISA test to screen for drugs in a patient's urine, what is the third step in the test process?
A) substrate for the enzyme is added B) enzyme-labeled antibodies against the drug being tested is added C) the patient's urine sample is diluted D) antibody against the drug being tested is added