In the phylogenetic tree above, which of the following groups is most closely related to mammals?
a. snakes
b. amphibians and all reptiles are equally related
c. all reptiles and birds
d. all reptiles but not birds
e. amphibians
B
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The amino acid that operates at most inhibitory synapses in the brain is _____
A) acetylcholine B) epinephrine C) endorphin D) nitric oxide E) gamma-aminobutyric acid (GABA)
Caring for patients infected with a new virus requires safety precautions for medical personnel. Choosing appropriate procedures is an example of a(n) ________ process.
A. inductive B. pathogenic C. deductive D. hypothetical
You are working in a lab and come across a gene, Gene X, that you think might explain some of the differences seen between chimpanzees and humans. Which of the following results would support your hypothesis?
A. if Gene X was active in humans, juvenile chimpanzees and inactive in adult chimpanzees B. if Gene X was active in humans, adult chimpanzees and inactive in juvenile chimpanzees C. if Gene X was active in adult humans and adult chimpanzees but inactive in juvenile humans D. if Gene X was active in juvenile humans, juvenile chimpanzees, and adult chimpanzees but inactive in adult humans
In order to test a hypothesis, a scientist would measure which of the following during an experiment?
a. the independent variable b. the dependent variable c. the standard variable d. the constant