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A)In a classic experiment, cells were treated with tritiated thymidine and fixed immediately. The cells were then treated for autoradiography and then examined in a microscope. What the researchers were looking for was the timing of DNA synthesis. First, why use tritiated thymidine and not some other nucleotide?
B)In this experiment described above, the researchers looked specifically for mitotic figures, that is cells actively undergoing mitosis. They saw no radioactive mitotic figures. Why not?
C)How would you do the experiment described differently so that labeled mitotic figures would be observed?
What are the primary differences between animal cells, plant cells, and bacteria cells? What chacteristics do they share.
Why are the genes involved in lactose metabolism considered to be an operon? Choose one answer. a. They are under the control of the same promoter. b. They occupy adjacent locations on the E. coli chromosome. c. They are all required for normal ..
According to your results would you say that the radish has a broad pH tolerance? Why or why not? Use your data to support your answer.
What is the end organic product of glycolysis, and how many of these organic molecules that enter the citric acid cycle are produced from the breakdown of one molecule of glucose?
What are the roles of the cell surface, the cytoskeleton and intercellular signaling in development? Include examples from gastrulation, induction, morphogenesis and axis formation.
Grandma has occasional pain in her chest. When this occurs, she puts a nitroglycerin tablet under her tongue and after awhile, the pain goes away. What condition does grandma suffer from? What causes this pain in her chest? How does the nitroglyce..
Assume you have a stock solution with a concentration of 722g/L. You want to make one liter of solution with a concentration of 39g/L.
How can a genetic street number be placed on the surface of viruses and be used for the optimization of proteins?
A factor that might contribute to increasing species numbers over time is the evolution of increased specialization in resource use, whereby more species coexist by more finely partitioning resources.
At a talk by a visiting scientist, you learn about a strain of bakers' yeast that contains a mutation called gal1- in its galactokinase gene. Because this gene is needed to metabolize galactose, the mutant strain cannot grow in galactose medium.
Explain why carcinomas are more common than sarcomas? Describe briefly your favourite new term or concept from this class.
Not much more than 100 years ago, ordinary citizens were unaware of the role of microorganisms in the cause and spread of disease. In her book, "The Gospel of Germs",
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