Before they enter the blood stream, what
modification occurs to erythrocytes?
a. they are loaded with ant-bacterial
compounds
b. they lose their nucleus and other organelles
c. they absorb oxygen and release carbon
dioxide
d. they are wrapped in a double plasma
membrane
e. they absorb nutrients and expel wastes
B
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The center of consciousness and intelligence is the
a. medulla oblongata. b. thalamus. c. pons. d. cerebellum. e. cerebrum.
The process by which elevated nutrient levels lead to an overgrowth of algae and the subsequent depletion of water oxygen levels is known as
A. assimilation B. decomposition. C. succession. D. biogeochemical cycling. E. eutrophication.
Analysis of a patient's lung tumor reveals that all of the malignant cells in this tumor have a specific chromosomal abnormality involving a fusion event between two sets of chromosomes. This MOST likely suggests that
a) This mutation was inherited. b) The tumor is polyclonal. c) The tumor is monoclonal in origin. d) A large number of normal cells simultaneously underwent this mutation.
Organisms are composed of molecules, which are collections of smaller units, termed
A. polymers. B. electrons. C. ions. D. monomers. E. atoms.