In the experiments constructed by Pasteur to disprove spontaneous generation, swan-necked flasks were used. Why was this shape of flask used in this experiment?
A. The shape of the glass neck allowed the bacteria into the flask and then into the media, but air could not enter.
B. Because the glass necks were stretched out, the heat used to sterilize the medium inside of the flask could not kill the bacteria in the neck.
C. The glass necks needed to be open to the air, yet constructed so that bacteria would settle in the lowest part of the neck.
D. These flask shapes were the easiest and cheapest to produce.
Answer: C
You might also like to view...
During the adaptive radiation of jawed fishes 400 million years ago, most cephalopods ________
a. lost their external shell and became active, quick, and relatively intelligent b. evolved thicker, heavier shells requiring a sessile lifestyle c. became herbivores, subsisting on algae and ocean plants d. became extinct
What is responsible for the dispersion of excess heat from the tropics to higher latitudes?
a. Greenhouse gases b. Decreased solar radiation c. Winds, waves, and currents d. Seasonal changes in the atmosphere
If one parent has achondroplasia, and the other is normal, what are the odds that they could have a normal child?
a. 0 b. 25% c. 50%. d. 75% e. 100%
what is the effect of botulism toxin?
What will be an ideal response?