In a bacterial species genes q, r, s, and t were mapped in minutes through interrupted mating experiments. The results placed q and s on the two outer ends, but r and t were not resolvable by minutes
You have discovered no phage that can infect this species. If you have a q r s t Hfr strain and a q- r- s- t- F- strain, how could you measure the distance between the genes in map units?
There are two ways. (1 ) You could do a conjugation experiment in which you select for the last marker in, to be sure that all the DNA was available for recombination, and measure (recombinants in the various gene pairs/total) X 100 for map units. (2 ) You could do a similar experiment through transformation. To do so, you would isolate and fragment the DNA from the q r s t strain and use it to transform the q- r- s- t-. In this case you would need to select for q s colonies to make sure that the entire region was likely to have entered the recipient cells.
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The tough outer covering of the eye is referred to as the
A. pupil. B. retina. C. sclera. D. fovea. E. iris.
Which type of macromolecule is present in enzymes?
A) carbohydrates B) lipids C) nucleic acids D) proteins
These organisms often have both a polyp form and a medusa form in their life cycle.
(A) Echinoderms (B) Annelids (C) Arthropods (D) Cnidarians (coelenterates) (E) Chordates
What is gene annotation in bioinformatics?
A) finding transcriptional start and stop sites, RNA splice sites, and ESTs in DNA sequences B) assigning names to newly discovered genes C) describing the functions of noncoding regions of the genome D) matching the corresponding phenotypes of different species