The sense organ in Figure 43-1 includes receptor cells referred to as:
a. otoliths, structures labeled 1.
b. hair cells, structures labeled 2.
c. statocysts, structures labeled 5.
d. Meissner corpuscles, structures labeled 3.
e. Merkel discs, structures labeled 4.
B
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Found mostly in marine environments, members of the ____ flatworm lineage are free-living,and acquire food with a
muscular pharynx; most are hermaphroditic.
a. Trematoda b. Turbellaria c. Polychaeta d. Cestoda e. Hirudinea
In humans, hemoglobin is contained within
A. plasma. B. red blood cells. C. oxygen. D. platelets.
When the air in a testing chamber is specially mixed so that its oxygen content is 10% and its overall air pressure is 400 mm Hg, then PO? is
A) 400 mm Hg. B) 82 mm Hg. C) 40 mm Hg. D) 21 mm Hg. E) 4 mm Hg.
What mechanism is used to finely tune enzyme activity according to the needs of the cell?
A) enzyme specificity B) competitive inhibition C) allosteric regulation D) coupled reactions