The granules of basophils contain ________.
A. digestive enzymes
B. histamine
C. antigens
D. lysozyme
E. antibodies
Answer: B
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Proteins function as all of the following, except
one. Select the exception
a. structural units. b. hormones. c. defense molecules. d. enzymes. e. energy storage
Dictyostelium discoideum is an unusual organism, one that straddles the boundary between the unicellular and the multicellular. Its feeding phase consists of individual amoeba-like cells that move independently, feeding on bacteria by phagocytosis. When the food runs out, cells begin to aggregate into a multicelled structure that migrates toward light. The cells differentiate into a base, stalk, and spores; only the spores survive to colonize a new habitat. Dictyostelium discoideum is which of the following?
a. A protozoa b. An apicomplexan c. An algae d. A diatom e. A slime mold
During which phase of the eukaryotic cell cycle does DNA and chromosome replication occur?
A) The G1 phase of interphase B) Cytokinesis C) The S phase of interphase D) The mitotic phase
Manta rays, sting rays, and eagle rays are similar to lampreys in that they have cartilaginous skeletons. How are they different from lampreys?
A. They have gills. B. They have closed circulatory systems. C. They have bony fin lobes. D. They have jaws.