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.
a
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A seedling no longer needs its stored food sources once it develops
a. an embryo. b. cotyledons. c. leaves. d. roots.
Bacteriophages were used by Hershey and Chase to further elucidate our understanding of heredity. Why were bacteriophages used?
What will be an ideal response?
Considering the Avery et al experiments, which of the following would have been the appropriate control experiment(s) to support their conclusions?
A: Addition of plain growth medium without heat-killed S cells to the R cells. B: Addition of heat-killed S cell filtrate that had not been treated with any enzymes C: Addition of DNAse-treated heat-killed R-cells to S cells. D: A and B E: All of the above.