Refer to the paragraph on crucian carp. Gills serve multiple functions in fish in addition to gas exchange
Given the large surface area of gills with lamellae, what is the most likely explanation for why crucian carp cover protruding lamellae in their gills when levels of oxygen are normal? A) to prevent loss of heat to the surrounding water
B) to prevent loss of ions to the surrounding water
C) to prevent protein loss to the surrounding water
D) to prevent loss of oxygen to the surrounding water
B
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How is active retinal returned to the inactive state?
a. It isn't; rather, the cell degrades the active form and synthesizes new, inactive proteins. b. It is converted back to the inactive confirmation by a series of enzymes. c. It reverts back to the inactive state on its own. d. It is transported to a lysosome. e. The mechanism is not known.
Meiotic cell division replicates a cell's DNA ____________ and then divides ______________.
A. twice once B. once, twice C. twice, twice D. once, once E. None of the answers are correct
Two diseases that represent high-priority threats as biological weapons today are
A) smallpox and typhus. B) syphilis and HIV. C) anthrax and botulinum. D) anthrax and Salmonella.
If water is not reabsorbed in the colon:
A) diarrhea occurs. B) constipation occurs. C) the appendix may rupture. D) waste material is solidified.