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A population of Anopheles mosquitoes reaches very high densities, and is subjected to aerial spraying by DDT. The following six years, the mosquitoes are not observed at all, but the population was sprayed “just in case”. An outbreak occurs sevem years later,however, and this time, the aerial spraying with DDT […]

1. Select a molecule. List the atoms that that molecule is composed of and describe the type of bond that holds those atoms together. Be sure to explain how this bond works. 2. Often, prokaryotic cells exist as simple unicellular organisms, but in some species, prokaryotic cells can grow together […]

A regulator gene-minus strain of E. coli is constitutive for expression of the lac-operon because the repressor cannot bind tothe operator region even when lactose is present. By bacterialconjugation, it is possible to introduce into the regulator-minusstrain a wild type or regulator-plus gene, which can betranscribed. What effect does lactose […]

A five-month-old Caucasian female is brought into the clinic as the parent complain that she has been having ongoing foul-smelling , greasy diarrhea. She seems to be small for her age and a bit sickly but, her parent’s state that she has a huge appetite. Upon examination you find that […]