Why do we care how bacteria reproduce? conjugation is a huge problem for humans. in bacteria, conjugation can occur even between individuals of different species. the dna on plasmids often allows bacteria to grow in the presence of antibiotics, drugs intended to kill them. when these plasmids are shared by conjugation and many different plasmids are accumulated, new strains of bacteria are created. these new strains can fight off many, perhaps all, known types of antibiotics. this is becoming a big concern in human health. research multiple antibiotic resistance. then, list a few ways in which human activities contribute to this problem.

Which conditions are necessary for natural selection to occur? select all of the answers that apply. a. inheritable adaptations vary among individuals. b. the population size is increasing. c. more individuals are born than can survive. d. fitness varies among individuals. e. the environment changes suddenly and drastically.

You have been asked to lead a demonstration for the undergraduate microbiology lab course about the uses of negative staining when studying bacteria. a "negative" stain does not stain the bacterial cell itself but stains the space between cells. under magnification, the acidic (negativelycharged) nature of the stain will be repelled by the negatively charged bacterial cell wall and willleave the cell colorless in a stained background. negative stains are used primarily to reveal the presence of negatively charged bacterial capsules; therefore, they are also called capsule stains. encapsulated cells appear to have a halo surrounding them. the negative stain procedure does not require heat fixation, which limits any chances of alteration in bacterial cell shape and size. the bacterial suspension is added to a drop of stain, such as nigrosin or eosin, and drawn across the glass slide using a coverslip.nigrosin staining-not safranin staining-of klebsiella pneumoniae will allow for the visualization of the cell shape and the determination of the presence of a capsule.true/false

Explain two reasons you think it is important for scientists to search for new ways to treat cancer