An individual’s DNA is
a) is identical in all cells
b) is identical only in some cells
c) varies depending on cell type
d) is identical to their mother's DNA
e) is very different in every cell
Answer: a) is identical in all cells
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Why do some single-celled eukaryotes occur primarily as haploid cells, whereas others occur primarily as diploid cells?
A. Only the eukaryotes that reproduce sexually will occur as diploid cells. B. Only the eukaryotes that reproduce sexually will occur as haploid cells. C. Only the eukaryotes that reproduce asexually will occur as diploid cells. D. Only the eukaryotes that reproduce asexually will occur as haploid cells. E. None of the answers options is correct.
Which type of microscopy transforms the subtle variations in cell density into differences in light intensity, allowing for increased internal detail without staining?
A. Confocal B. Bright-field C. Phase-contrast D. Fluorescence E. Electron
Transfers to and from environment reservoirs of
essential elements are __________ rates of exchange among organisms. a. much greater than b. somewhat greater than c. the same as d. somewhat slower than e. far slower than
Genetic regulation in eukaryotes can take place at a variety of levels from transcriptional to posttranslational. At what level is genetic regulation considered most likely in prokaryotes?
A) transcriptional B) intron processing C) capping D) polyadenylation of the 3' end of the mRNAs E) exon processing