Which of the following is an overgrowth of cells that serves no useful purpose?
A. tumor
B. oncogene
C. protooncogene
D. growth
E. callus
A. tumor
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Sponges are considered:
a. animals. b. plants. c. fungi. d. bacteria. e. Archaea.
Young male white-crowned sparrows that were experimentally raised without ever hearing the song of
their species ____.
a. never came close to singing the way wild males do b. never sang at all c. sang a poorly developed version of their species' song d. instinctively performed the song perfectly e. sang a recognizable version of the song of an ancestral sparrow species
In order for transcription to be initiated
A. DNA polymerase must have access to the RNA and must also be capable of binding to the gene's promoter. B. DNA polymerase must have access to the DNA double helix and must also be capable of binding to the gene's promoter. C. RNA polymerase must have access to the DNA double helix and also must be capable of binding to the gene's operator. D. RNA polymerase must have access to the DNA double helix and must also be capable of binding to the gene's promoter. E. RNA ligase must have access to the DNA double helix and must also be capable of binding to the gene's promoter.
The rootlike projections of mosses, liverworts, and hornworts that anchor them to the substrate are called
A. tap roots. B. rhizoids. C. storage roots. D. fibrous roots. E. specialized roots.