In 1861, pasteur conducted his now-famous experiments using flasks with long necks bent into an s-shape. imagine that you are a scientist working in pasteur’s lab at this time. you decide to tip the flasks so that broth enters the long s-shaped neck. you then return the flask to its upright position. predict the most likely outcome of tipping one of pasteur’s s-necked flasks.
microbes would grow in the broth because the tipping would introduce the oxygen necessary for microbial growth.
the broth would become contaminated with microbes because they were trapped in the neck.
since the broth had been heated (effectively sterilizing it), no microbes would grow in the broth.
the broth would remain uncontaminated because no microbes could enter the long s-shaped neck of the flask.