Distinguish between manipulative experiments and natural experiments
What will be an ideal response?
In manipulative experiments a researcher compares data from an experimental treatment that is
manipulated to data from a control, where nothing is manipulated, to test predictions of a hypothesis.
In natural experiments a researcher uses variation that is already present in data to test predictions of a
hypothesis.
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In a strand of DNA, a cytosine base has been replaced by guanine. What kind of mutation has occurred?
a. frameshift mutation b. transition substitution c. transversion substitution d. translocation
The potassium pump may be characterized as
a. typically open. b. allowing both sodium and potassium to pass through. c. an embedded protein in the plasma membrane in the neuron. d. resulting in a slight negative charge in the neuron. e. an embedded protein in the plasma membrane in the neuron that results in a slight negative charge in the neuron.
If you placed a coleoptile in unidirectional light and then immediately covered the tip, which of the
following would happen? a. The coleoptile would bend toward the light. b. The coleoptile would not bend. c. The coleoptile would bend away from the light. d. The coleoptile would die. e. The coleoptile would grow in a spiral pattern.
In one strand of DNA, the nucleotide sequence is 5'-A-T-G-C-3'. The complementary sequence in the other strand must be
A) 5'-A-T-G-C-3'. B) 3'-T-A-C-G-5'. C) 3'-G-C-A-T-5'. D) 5'-C-G-T-A-3'.