In cnidarians, the mouth of both the medusa and polyp form opens into an internal ____ where _____ digestion takes place
A. gastric cavity; extracellular
B. gastric cavity; intracellular
C. mesoglea; extracellular
D. mesoglea; intracellular
E. none of these
A
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In order to take up a naked DNA molecule, a cell must be ________, which may occur only at certain stages in the life cycle of the organism.
Fill in the blank(s) with the appropriate word(s).
What are the helper and inducer cells?
A. B cells B. macrophages C. plasma cells D. T cells E. monocytes
The most probable consequence of ozone depletion is
a. global warming. b. an increase in skin cancers. c. eutrophication. d. fish kills in shallow lakes. e. groundwater contamination.
How do viruses make copies of themselves?
A) By taking the nutrients of the host cell they infected B) By using the cellular machinery of the host cell they infected C) By digesting the host cell they infected D) By targeting their host cell they infected for cell death