The age of a fish can be determined by counting the annual rings of otoliths (ear bones)
Indicate whether the statement is true or false
TRUE
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What is the first step during transcription initiation in prokaryotes?
A. the transcription bubble is formed B. RNA polymerase binds to the promoter C. the DNA double helix is unwound D. RNA polymerase synthesizes a short primer E. transcription factors bind to the TATA box sequence
A stretch receptor is classified as a
a. chemoreceptor. b. mechanoreceptor. c. photoreceptor. d. thermoreceptor. e. all of these
Why does meiosis promote genetic variability?
A. Meiosis undergoes one cell division producing diploid cells. B. Meiosis undergoes one cell division producing haploid cells. C. Meiosis undergoes two cell division producing diploid cells. D. Meiosis undergoes two cell division producing haploid cells.
Drug-resistant populations of microbes arise when
A) exposure to drugs selectively kills sensitive cells, allowing overgrowth of resistant cells. B) exposure to drugs causes mutations that produce resistance. C) resistant cells become numerous in a population due to their greater vigor. D) the patient becomes immune to the drug. E) synergy between medications occurs.