The nerve net of Hydra:a
contains a central control organ and connected neurons.
b. sends electrical signals in only one direction.
c. allows the organism to respond to stimuli approaching from any direction.
d. produces a signal that intensifies as it radiates from its point of origin.
e. cannot coordinate the movement of all tentacles at once.
C
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Eukaryotic cell mRNA transcripts can remain in the cell for hours because they are
A. stable. B. long. C. isolated. D. analogous.
Water constantly enters the cells of a freshwater sponge by osmosis. How is the sponge adapted to handle this problem? a. Contractile vacuoles expel fluid to the outside of each individual cell
b. Action of cilia in flame cells drives interstitial fluid into tubes, then out of pores at the surface. c. Extra water and wastes are transported into Malpighian tubules that route them out of the body. d. Water is excreted through tubular excretory organs called nephridia.
In marine crocodiles excess salts are removed by:
a. salt glands in the tongue. b. salt glands above the eyes. c. concentrated urine. d. salt glands on the skin. e. salt glands in the nose.
An inactivated toxin, such as that found in the tetanus vaccination, is called a(n)
a. anti-toxin. b. toxoid. c. toxin. d. toxemia.