An ecological area inhabited by a specific species is its ________.
Fill in the blank(s) with the appropriate word(s).
Habitat
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In Caenorhabditis elegans vulval development, the fate of the progenitor cells is dependent on their proximity to the ____ cell, which secretes epidermal growth factor
Fill in the blank with the appropriate word.
Red tides are caused by
a. formaniferans. b. dinoflagellates. c. many different organisms from many different classification groups. d. sea weeds. e. ciliates.
Which of the following statements is false?
a. Only B cells and their progeny make antibodies. b. The primary immune response is faster and more complete than a secondary immune response. c. Naive B cells already have antibodies but have not yet encountered an antigen. d. Macrophages will digest invading bacterial cells but do not destroy the antigens that eventually become mounted on their surfaces. e. B cell progeny may differentiate into memory cells.
Which protist causes a sexually transmitted disease?
A) Pfiesteria B) Trichomonas C) Trypanosoma D) Plasmodium E) Giardia