Many organisms grow in areas where sun and nutrition sources are poor, such as the hydrothermal vents at the bottom of the ocean. By what process do these organisms make their own food?
a. photoautotrophy
b. diffusion
c. chemoautotrophy
d. predation
c. chemoautotrophy
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Which region of a structural gene contains the information that specifies an amino acid sequence?
A. promoter region B. transcribed region C. terminator D. regulatory sequence E. enhancer region
Select the immunoglobin (Ig) classes that is correctly matched to their facts. Check all that apply.
_____ IgA—found in saliva, tears, the GI tract, and mother's milk _____ IgD—serve as receptors on the surfaces of T cells _____ IgE—promotes the release of histamine from mast cells and basophils, causing allergy symptoms _____ IgG—a minor form of immunoglobulin, used only in response to parasitic worms _____ IgM—first secreted during primary response, promotes agglutination, activates complement
To which of the following groups does the
organism in the above figure belong? a. diplomonads, parabasalids, trypanosomes, and euglenoids b. ciliates, dinoflagellates, and apicomplexans c. water molds, diatoms, and brown algae d. chlorophyte and charophyte algae e. amoebas and slime molds
Which of the following leukocytes have granules in their cytoplasm that stain blue with methylene blue?
A) eosinophils B) monocytes C) lymphocytes D) neutrophils E) basophils