Three Hfr strains of E. coli, each with genotype StarS, lacZ, A, B, C, D are mated to an F- strain with the genotype StrR, lacZ-, a, b, c, d. Samples of conjugating strains are collected and disrupted every minute for one hour using a blender. Cells are plated under conditions that allow the lacZ , A, B, C, and D alleles to be identified. The time at which each dominant allele is transferred is shown. lacZ A B C DHfr1 50' 5' 15' 40'Hfr2 2' 47' 70' 37' 12'Hfr3 45' 15' 55'Considering that some variation exists between bacterial strains in the overall size of their chromosome (in min), how many minutes are in the complete genome of this strain?A) 85.B) 88.C) 93.D) 98.

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands

the "power" of a lens is its resolution power, or its ability to distinguish between to closely located points. with the low power lens, it is likely you will see the rough form of the hay and maybe some movement of dots around the hay. however, when observed with the high power lens, the detailed features of the hay become visible and the microbes being grown are more clearly visible.

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