Rickettsias enter host cells by inducing ________.
Fill in the blank(s) with the appropriate word(s).
phagocytosis
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Four of the five answers listed below possess
vascular tissue. Select the EXCEPTION.
a. grasses b. mosses c. conifers d. ferns e. ginkgos
The ability of a vertebrate to generate millions of different lymphocytes is a result of its DNA undergoing what process?
A. DNA reestablishment B. DNA rearrangement C. Clonal variability D. Gene cloning E. Instructional variation
__________ stores oxygen in the slow-twitch muscle
tissues. a. Hemoglobin b. Mitochondria c. Myoglobin d. Fermentation e. None of these
Chemoreceptors respond primarily to changes in PCO2 indirectly by its effect on
A) hydrogen ion concentration. B) hemoglobin concentration. C) 2,3-diphosphoglycerate (2,3-DPG) concentration. D) lactic acid concentration. E)PO2.