A relationship that has been established based on a large amount of observational and experimental data is a(n)
A) fact.
B) assumption.
C) conjecture.
D) theory.
Ans: D) theory.
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The interaction between two species in which
both species may be harmed is known as
a. parasitism. b. mutualism. c. competition. d. predation. e. commensalism
Four of the five actions listed below are true of
testosterone. Select the exception. a. promotes secondary sex characteristics b. influences sexual behavior c. necessary for growth and function of male reproductive tract d. stimulates spermatogenesis e. produced by spermatogonia cells
Which statement concerning a scientific theory is FALSE?
a. It is unchangeable. b. It predicts new facts. c. It is based on a number of hypotheses. d. It may suggest practical applications. e. It is supported by many observations.
Eukaryotic chromosomes are composed of a complex of 60% protein and 40% DNA. This complex is referred to as
A. the histone complex B. the kinetochore C. chromatin D. cohesin