Select the plant behavior that arises from internal stimuli.
A. Phototropism.
B. Thigmotropism.
C. Cytokinins promoting cell division.
D. Nondevelopmental formation of aerenchyma.
C. Cytokinins promoting cell division.
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The exoskeleton of insects is composed mainly of what material?
A. chitin B. calcium carbonate C. hydroxyapatite D. collagen E. waxes
Which brain structure is the largest and most complex?
A. The hypothalamus B. The thalamus C. The cerebrum D. The cerebellum
Which of the following will increase the loading of oxygen onto the hemoglobin molecule within the lungs?
A) decreased pH B) decreased hydrogen ion concentration C) increasedPCO2 D) increased 2,3-bisphosphoglycerate (2,3-BPG) E) increased body temperature
The ________ involves proteins in the plasma that are activated when bacteria or fungi are present. These puncture holes in the cell walls of invaders.
A. complement system B. inflammatory response C. macrophagic defense system D. natural killer cell