You are generally not aware of the texture of the cloth of your shirt as it rests on your shoulders, unless someone or something happens to make you think of it. What part of the brain is responsible for filtering out such stimuli?
A) reticular activating center B) cerebellum
C) primary motor area D) postcentral gyrus
Answer: A
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Which of the following statements about Caenorhabditis elegans is FALSE?
a. It is asexual. b. It is anatomically simple. c. It has a fixed cell number. d. Specimens do not have to be killed to be studied. e. It completes its life cycle in three days.
The rapid diversification of species seen in the fossil record followed by long periods of stasis is part of the ________ model of evolution.
A. symmetric B. spatial C. punctuated equilibrium D. graduated
In what way can defective transportable elements alter genomes even if they cannot mobilize? (Select all that apply.)
A) Crossing-over between transportable elements on the same chromosome can result in a deletion or an inversion. B) Crossing-over between transportable elements on non homologous chromosomes can result in a reciprocal translocation. C) Genes located between two transportable elements could be moved to a non homologous chromosome. D) Proteins produced by the defective transposable elements introduce point mutations in other areas of the genome.
During the human female sexual response, the sympathetic system causes
a) vasocongestion of the vagina b) vasocongestion of the clitoris c) reduction of the circumference of the vagina d) lifting of the cervix e) the sympathetic does not cause any of the above