In order to be successful, chemotherapy drugs have to stop cell division. The most likely method for this would be to ________
A) denature all the enzymes in the cell so division can't occur
B) speed up the cell cycle in the cancerous cells
C) stop cellular respiration so the cancerous cells don't have energy
D) interfere with the function of the spindle fibers
D
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Explain how you would use Robert Koch's postulates to determine that Streptococcus pyogenes is the causative agent of streptococcal pharyngitis ("strep throat")
What will be an ideal response?
The cell wall is a common feature to
A. prokaryotic cells only. B. plant cells only. C. animal cells only. D. prokaryotic and plant cells. E. prokaryotic, plant, and animal cells.
One technique used to yield a transgenic animal is to
A) amplify DNA from a donor animal and another organism of interest using PCR. B) remove all of the DNA from an animal fetus, and insert new DNA of interest through the use of synthetic DNA "carriers." C) microinject the DNA of interest into an animal's egg. D) introduce proteins from a foreign organism into the blood of a pregnant animal, so that the protein sequences will be used to produce a new DNA template. E) inject the DNA of interest into an animal's bone marrow.
Currently, atmospheric CO2 levels are approximately 400 ppm. The annual mean growth rate in CO2 is about 2 ppm/year. Assuming this trend continues, what would you predict the CO2 level to be in 100 years?
A) 100 ppm B) 200 ppm C) 600 ppm D) 1,000 ppm