Variables that are always different between the experimental and the control groups are
a. independent.
b. controlled.
c. dependent.
d. a and c.
c
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What animal group is mismatched with its circulation system type (open or closed)?
A. earthworm—closed B. lobster—open C. killer whale—closed D. cricket—closed E. oyster—open
Why is the polymerase chain reaction (PCR) so useful for DNA fingerprinting?
A) It can produce millions of copies from tiny amounts of DNA. B) It can be used to compare DNA from different individuals. C) It can identify the complete sequence of a gene. D) It can allow scientists to visualize the DNA of specific individuals.
Evidence from Stanley Miller's experiments and evidence from carbonaceous chondrites collected from meteorites, taken together, most directly support the contention that
a. life can arise under conditions of extreme heat or cold. b. organic molecules can be synthesized by natural chemical processes. c. life did not arise on earth, but rather arrived from another planet by meteorite. d. living organisms are required to produce complex organic compounds. e. organic compounds require gravity for their formation.
Four of the five answers listed below are located within the spinal cord. Select the exception
a. dorsal root ganglion b. interneurons between sensory input and motor outputs c. major ascending and descending nerve tracts d. interneurons connecting with other neurons e. direct reflex connections between sensory and motor neurons