X-gal is a synthetic molecule which is a substrate for beta-galactosidase (b-gal). when cells are grown on a medium containing x-gal, they turn blue if the cells are expressing b-gal. in the absence of b-gal expression, the cells are white. you are attempting to clone a gene of interest into a lacz reporter gene of a plasmid and introduce your recombinant molecule into a bacterial host sensitive (i. e. not resistant) to ampicillin. the plasmid contains a gene for ampicillin resistance at a position other than the cloning site. you grow your potential transformants on media containing both ampicillin and x-gal. which of the following results would most likely indicate a successful clone?

cells which form blue colonies on the ampicillin plates
cells which form white colonies on the ampicillin plates
cells which form light blue (half blue, half white) colonies on the ampicillin plates
cells which do not grow on the ampicillin plates
none of the above results would indicate a successful clone.

Consider this plant cell which organelle is labeled g

Archeologists have discovered three sites showing conclusive evidence for the mastery of fire in tanzania, from a period slightly after the time that homo habilis was present in africa. these sites clearly were founded by homo erectus, the descendent species of homo habilis that migrated north, out of africa and into asia. homo erectus was known to have mastered fire, from ample evidence at sites in asia. there is no reason to attribute mastery of fire to homo ergaster, the descendent species of homo habilis that remained in africa.which of the following is an assumption on which the argument depends? (a) before their migration, homo erectus occupied african territory as far south as tanzania.(b) the strain of migration provided the selective pressure motivating homo erectus‘ mastery of fire.(c) homo ergaster would not have derived as much benefit from the mastery of fire as did homo erectus.(d) homo ergaster inherited all cultural knowledge from homo habilis, a species that did not have mastery of fire.(e) homo ergaster did not occupy regions as far south as tanzania until well after the time of these three sites.

Babies with very low or very high birth weight are less likely to survive. observe a graph of the data.