MCB 3020 Lecture 12: microbio lecture 12
Document Summary
Turns on and off depending on the presence of lactose/glucose. Piece of dna between the promotor and the genes on an operon. Removed from the operon when lactose is present. Enzyme that binds to amp (adenosine monophosphate) and turns on the "signaling light" for the lac operon to be turned on. Lactose must be present, and the cell must have only amp left. 4 features of prokaryotic microbes: diversity, ubiquity, large numbers, pervasive impact Cellular microbes: fungi (molds and yeasts, protists (algae and protozoans etc, bacteria, archaea. Acellular microbes: viruses (nucleic acids and proteins, viroids (rna, virusoids (rna, prions (protein) First person to observe and describe bacteria accurately. 2 key letters to royal academy in britain in 1683 & 1692 that specifically described bacteria. Showed that maggots arise from eggs laid by flies and not by spontaneous generation experiment: -one jar covered by cheesecloth meat without maggots (did not spoil)
