Design an experiment to compare the effectiveness of a physical and a chemical method of disinfection
What will be an ideal response?
Appropriate controls and methods should be included. An example is comparison of filtration and chlorine bleach.
Prepare a culture of bacteria of known cell concentration. Divide into three samples. Sample #1 is the positive control. Sample #2 is filtered using a specified pore size filter (0.45 micron maximum pore size) and the filtrate collected into a sterile container. Chlorine bleach is added to Sample #3 following manufacturer's directions for dilution. The three samples are incubated, then the turbidity of each is measured to determine if growth is evident in the two treated samples compared to the untreated sample.
Bloom's Taxonomy: Synthesis
Section: Chemical Methods of Microbial Control
Learning Outcome: 9.10, 9.19
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The actin cytoskeleton is associated with which type of cell movement?
A. movement of cilia B. ameboid crawling C. transport of organelles within a cell D. Answers b and c are both correct.
How does the blister rust impact the Yellowstone ecosystem?
a. It reduces the availability of whitebark berries. b. It reduces the numbers of grizzly bears. c. It reduces the numbers of gray wolves. d. all of these
The chemical reaction in the accompanying figure occurs in the:a
stomach as the result of secretions from the pancreas. b. small intestine as the result of secretions from the pancreas. c. large intestine as the result of secretions from the small intestine. d. stomach as the result of secretions from the stomach. e. small intestine as the result of secretions from the liver. What will be an ideal response?
One spring, your friend living in Minnesota eagerly sets up her new hummingbird feeders, and is thrilled to watch hummingbirds feeding on the nectar. However, she is disappointed when after just a week or two the hummingbirds disappear. What advice would you give her?
A. Set up a bell (conditioned stimulus) near the feeders so the hummingbirds make an association with the food. B. Set up flashing red lights that mimic the male neck feathers -- that should attract more males to the area. C. Wait till next year -- hummingbirds are a high-metabolism, semelparous species and have already reproduced and died. D. Set up the feeders again in the fall. The hummingbirds may have briefly traveled through during their annual spring migration.