Which statement regarding the scientific method is FALSE?
(a). Inductive reasoning is used to form a hypothesis.
(b). Observations are used to form a hypothesis.
(c). Experiments need to be repeatable.
(d). Original hypotheses are formed after an experiment.
(e). The control and experimental group are identical except for one variable.
(b). Original hypotheses are formed after an experiment.
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In the Lederberg and Tatum experiment what is the purpose of performing the experiment with the strains without adding them together?
A. It serves as a control to calculate the rate of reversion mutations B. There is no experimental purpose to performing that part of the experiment C. It tests that the strains were made correctly D. It tests to make sure the media was made correctly
Which of the following structures is an example of a tissue?
a. the heart b. a blood vessel c. the brain d. cartilage
Chicken pox can reemerge as which disease?
A) cowpox B) genital warts C) shingles D) smallpox
In a species of salamander, there are two forms, red and yellow. As the yellow form becomes less common due to predation and the red form more common, the yellow form becomes less likely to be eaten and more likely to survive and reproduce. The yellow form then becomes more common and roles of red and yellow forms reverse. This is an example of
A. disruptive selection. B. balancing selection. C. directional selection. D. negative frequency-dependent selection.