Primary sewage treatment includes ________.
A. skimming
B. aeration
C. chlorination
D. filtration
E. sludge digesting
Answer: A
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According to the cohesion-tension mechanism of water transport, cohesion occurs because
a. waxy coatings on insides of xylem keep water molecules together in the xylem. b. evaporation removes water from the leaves. c. water molecules tend to form hydrogen bonds with each other. d. water is pushed into the xylem by bulk flow. e. water is pushed into the xylem by phloem pressure.
How are B-cell receptors different from T-cell receptors?
a. B-cell receptors bind antigen, while T-cell receptors do not. b. B-cell receptors have a more complex structure. c. B-cell receptors have a more simple structure. d. B-cell receptors are bound to the cell membrane, while T-cell receptors are bound to the nuclear membrane. e. B-cell receptors stimulate the production of a clone of cells.
_____ are the closest protistan relatives of the fungi and animals
a. Stramenopiles c. Apicomplexans b. Radiolarians d. Amoebozoans
Which body form of the cnidarians is sessile?
A) Jelly B) Fish C) Medusa D) Polyp