After working several hours in a flower shop, you do not detect the smell of the roses. Why?
a. Sensory adaptation has occurred.
b. Competing signal transduction pathways have been activated.
c. Sensory perception has been blocked.
d. Sensory summation has occurred.
e. The nasal epithelium has become blocked
a
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Which fish bones are homologous with an amphibian's front and hind limbs?
a. Tail, pectoral fin b. Pectoral fin, pelvic fin c. Pelvic fin, dorsal fin d. Pectoral fin, dorsal fin e. Gills, pelvic fin
Which of the following statements is not true of a benign tumor?
1.It grows slowly.
2.It expands into surrounding tissue.
3.It does not spread via the bloodstream or lymphatic system.
4.None of the choices; all are true.
Two pure-breeding mutant plants produce white flowers. When they are crossed, all of the progeny have wild-type purple flowers. What does this genetic complementation tell you?
A) The genes are part of distinct biosynthetic pathways. B) The two lines exhibit different mutations in the same gene. C) More than one gene is involved in determining the phenotype. D) The allele is pleiotropic. E) The allele exhibits incomplete dominance.
The atmosphere of the early Earth is currently thought to have contained:a
carbon dioxide, water, oxygen, nitrogen, and hydrogen. b. carbon dioxide, water, carbon monoxide, hydrogen, and nitrogen. c. carbon dioxide, carbon monoxide, water, hydrogen, and nitric oxide. d. carbon dioxide, ozone, nitric oxide, water, and hydrogen sulfide. e. methane, water, ammonia, nitrogen, and oxygen.