Birds and fishes overcome gravitational forces primarily through their ________.
A. body shape and density
B. lubricating secretions
C. smooth outer covering
D. textured surface
E. reduced surface area in contact with the ground
Answer: A
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In tissue capillaries, __________ combines with water to form carbonic acid, which after being transported to the lungs, dissociates back to its constituents.
A. CO2 B. O2 C. H2CO3 D. hemoglobin E. HCO3-
Which of the following is NOT a result of low
intensity but long duration exercise?
a. increased capillary growth b. decreased number of mitochondria c. decreased white fibers d. increased amounts of myoglobin e. all of these are a result of low intensity but long duration exercise
What are oncogenes?
A. Oncogenes are necessary genes that inhibit the cell cycle. B. Oncogenes are mutated proto-oncogenes. C. Oncogenes are necessary genes that help regulate the cell cycle. D. Oncogenes are mutated tumor-suppressor genes.
Cephalopods are the only mollusks that possess
a. a mantle. b. gills. c. a closed circulatory system. d. shells. e. a closed circulatory system and shells.