The weakest symbiotic association, in which one
species simply lives better in the presence of another
species is
a. commensalism.
b. competitive exclusion.
c. mutualism.
d. facultative obligate mutualism.
e. parasitism.
Answer: a
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The layer of a forest in which decomposition takes place and mineral nutrients are released for reuse by plants is called the
A) canopy. B) understory. C) herb layer. D) forest floor.
Each ________ on the hemoglobin subunit is capable of binding an oxygen molecule, thereby allowing ________ oxygen to bind with one hemoglobin molecule.
A) globin : four B) heme : four C) globin : three D) heme : three E) free iron : one
Answer the following statements true (T) or false (F)
1. In an autoclave, microorganisms are killed by ethylene oxide. 2. The goal of disinfection is to kill all microorganisms. 3. It is not possible to culture protozoa in the laboratory. 4. Rapid freezing, using liquid nitrogen, is an excellent method of killing microorganisms. 5. Microorganisms can be killed by direct exposure to ultraviolet light.
Multicellular animals belong to the kingdom
a. Plantae. b. Animalia. c. Prokaryotae. d. Fungi.