Trypanosomes have a novel post-transcriptional process for editing mitochondrial rna. in this form of rna editing, several uracil bases are inserted at specific locations in an mrna (e. g., for purposes of shifting the reading frame into correct position). the insertions are directed by short guide rnas (grnas) that encode editing "instructions" in the form of complementary base-pairing sequences. which enzyme involved in this process catalyzes the addition of uracil (u) bases to the mrna?

Follow the directions for self-quiz question 8, draw it, by labeling the appropriate structures with these terms, drawing lines or brackets as needed: chromosome (label as replicated or unreplicated), centromere, kinetochore, sister chromatids, nonsister chromatids, homologous pair, homologs, chiasma, sister chromatid, cohesion

At the beginning of the virtual lab, you were asked to sort eight lizards into categories. what criteria did you initially use to make your groups? did you revise your criteria later? why?

Waste water from industries and domestic sources can be treated by chlorination or ultraviolet radiation. there are pros and cons to using either chlorine or uv radiation to kill harmful microorganisms. what is one reason chlorination would be preferred over ultraviolet radiation? a) chlorine only eliminates visible impurities and is ineffective against microorganisms. b) chlorine not only kills bacteria but provides a residual effect on returning microorganisms. c) uv radiation can be used only to treat drinking water and is ineffective in treating waste water. d) ultraviolet radiation is more effective