The variation in the numbers of phage resistant mutants (among different E. coli cultures) seen in the Luria-Delbruck fluctuation test is a reflection of: Group of answer choices Differing levels of mutagenesis in the different cultures The differing media in which the bacterial cultures were grown The concentration of phages in the phage suspension added to the cultures The growth phase of the bacterial cultures, before being challenged with phage When the mutation(s) conferring resistance arose (i. e. early or late), during growth of the different cultures

Glutamic acid: hydrophilic or hydrophobic? positive, negative, or neutral? valine: hydrophilic or hydrophobic? positive, negative, or neutral?

Compare and contrast region e in the illustration above with region d. describe the physical characteristics of each region.

Recent research by marine biologists suggests that bottlenose dolphins have names for themselves. scientists played sounds they had identified as the names of particular dolphins, putting them through a synthesizer so that they did not sound like the voices of particular dolphins. the researchers found that dolphins would respond to the names of other dolphins that they were related to or associated with, but they ignored the names of strangers. this discovery suggests a much greater degree of self-awareness in aquatic mammals than was previously suspected. if this research holds up, what does it suggest about dolphins?