Commensalism is best described as a(n)
A) unsuccessful microbial invasion due to the presence of preexisting microbes.
B) relationship between two organisms where only one member benefits and the other is unharmed.
C) relationship between two organisms where both members benefit.
D) relationship in which a microorganism causes disease.
E) source of contamination.
B
Bloom's Taxonomy: Knowledge
Section: Symbiotic Relationships Between Microbes and Their Hosts
Learning Outcome: 14.1
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Which of the following are the fundamental embryonic tissues called the "germ layers"?
A. tissues, organs, and organ systems B. mesoderm, muscle, and tissue C. ectoderm, endoderm, and exoskeleton D. mesoderm, endoderm, and ectoderm E. mesoderm, exoderm, and hydroderm
Before nitrogenous wastes are excreted in
urine, they are converted first to ___ and then to ___.
a. urea--ammonia b. ammonia--urea c. glycogen--monosaccharides d. glycerin--fatty acids e. glyerin--urea
Which of the following is true for actin?
A. Portions of the actin molecule bend and move along myosin molecules. B. Actin binds to myosin. C. Actin uses up calcium ions. D. Actin conducts the nerve impulse to the muscle cell.
A flood that separates a population of frogs onto opposite sides of a lake is an example of a vicariance event that may result in allopatric speciation.
Indicate whether the statement is true or false.