scientists took a clue from naturally occurring dna mutations and began to use bacteria plasmids to alter genes in other organisms. first the simple, circular bacterial plasmid, that contains a small amount of dna, is isolated. a piece of dna with a gene of interest from another organism, plant or animal, is spliced into the plasmid dna. scientists place the transformed plasmid into a bacteria culture and the bacterial cells take up the altered plasmid. the new, recombinant bacterial cells multiply, now with the original plasmid containing the gene scientists were interested in cloning, for use in genetic engineering.  in this case, scientists have copied a type of naturally occurring genetic mutation calleda)deletion. b)reversion. c)insertion. d)crossing over.

Wind energy is plentiful in regions with vast open spaces it is a non polluting renewable resource what could be an economic factor that makes the use of this resource less feasible then non renewable resource even in such regions

When proteins are being produced by a cell, scientist say that the genes are question 2 options: activated turned off replicated deactivated

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.