When conducting a scientific experiment, which of the following is tested?
a) an observation
b) a prediction
c) a result
d) a question
e) the null variable
Ans: b) a prediction
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In a classic experiment, Otto Loewi electrically stimulated the vagus nerve of a frog heart. He then took the fluid bathing the stimulated heart and applied it to a second frog heart. The beating rate of both hearts slowed down with this treatment. Based on this response, you can assume the nerve he stimulated was part of the
A. parasympathetic system. B. sympathetic system. C. somatic system. D. central nervous system. E. atrioventricular system.
In most tests of genetic linkage, the number of double crossovers is less than the number expected due to what effect, which limits the number of crossovers that can occur in a short length of chromosome?
What will be an ideal response?
The enzyme reverse transcriptase was discovered by ________.
A. Boyer and Cohen B. Temin and Baltimore C. Jackson, Symons, and Berg D. Arber and Smith
Niches apply to:
a. individual organisms. b. individual species. c. groups of species. d. communities. e. ecosystems.