A scout troop sets out on a backpacking trip. Soon, an unexpected storm gets them drenched, and the troop leaders discover that few boys have packed warm clothes. Several scouts start shivering uncontrollably, a sign of hypothermia. The leaders call off the trip and the group heads back to their cars. This shivering response was
A. an attempt to produce heat by burning large amounts of ATP.
B. a maladaptive response that wastes energy.
C. an attempt to produce heat by creating friction with their clothing.
D. a social signal that evolved to alert adults to take action.
Shivering is used by mammals to increase body heat when the hypothalamus detects a body temperature below the set point. Although the behavior involves muscles, the outcome is not movement but "wasted" energy in the form of heat. This is an example of nature reusing a body structure for an additional purpose.
A. an attempt to produce heat by burning large amounts of ATP.
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To which of the following groups does the
organism in the above figure belong? a. diplomonads, parabasalids, trypanosomes, and euglenoids b. ciliates, dinoflagellates, and apicomplexans c. water molds, diatoms, and brown algae d. chlorophyte and charophyte algae e. amoebas and slime molds
The RNA molecule is made up of how many strands?
a. 1 b. 2 c. 3 d. 6 e. 12
Muscles of inspiration (inhalation) include the ________.
A. abdominal muscles B. biceps C. diaphragm D. two of the above
Model organisms are useful because:
A) they share basic processes with most organisms B) they are particularly useful as research subjects C) they share many similarities with humans at the molecular level D) all of the choices are correct