A hydrostatic skeleton seen in many invertebrates without an exoskeleton is based on the principle of
a. antagonistic muscle pairs.
b. synergistic muscle pairs.
c. an endoskeleton.
d. flexors and extensors.
e. adductors and abductors.
A
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Why are some body cells responsive to a particular hormone, whereas others are not?
A. Responsive cells express a specific receptor for the hormone. B. Responsive cells are located closer to the gland that releases the hormone. C. Whether or not a cell responds to a hormone depends entirely on what type of cell it is (liver cell vs. fat cell vs. nerve cell) because hormones only activate one type of cell. D. Responsive cells have complex signal transduction pathways, whereas cells that do not respond to a particular hormone lack these pathways. E. All of the answer options are correct.
The slide coagulase test is a rapid screening test for the production of:
a. clumping factor. b. free coagulase. c. extracellular coagulase. d. catalase.
The ____ lineage was a diverse group in the Mesozoic, but now is composed of only two living members, including
the tuatara.
a. Testudines b. Archosauria c. Squamata d. Sphenodontida e. Amphibia
How is malaria spread?
A. sexual intercourse B. airborne droplets C. breast-feeding D. blood transfusions E. mosquitoes