Give a possible interpretation of the finding that the number of mutational events that occur during the transition from normal to malignant cells is much larger than previously thought
What will be an ideal response?
It has always been assumed that the process of DNA replication is extremely accurate and that when mistakes are made that they are usually repaired as replication continues. In other words, unrepaired mutations are a relatively rare event. These recent findings could suggest that mistakes in replication are practically commonplace, but that even when there are, for example, dozens of gene mutations, the body does not form malignant tumors. Despite what we may think, it appears that since it takes an average of 90 mutant genes for the transition from normal to malignant cells, the body is extremely resilient to the formation of cancer.
You might also like to view...
Cells of Staphylococcus aureus are cocci measuring about 1 ?m in diameter. In a textbook image of S. aureus, each cell measures about 1 cm. The magnification of the image on the page is ________.
A. 0.001X B. 10,000X C. 0.0001X D. 1,000X E. 100X F. 0.01X G. This is impossible to calculate without more information.
The following graph represents the concentration of cyclins over the course of the cell cycle. Which of the following statements is TRUE regarding the phase of the cell cycle where the green arrow is pointing?
A. At this point in the cell cycle, the cell has determined that the DNA is intact and environmental conditions are favorable for DNA replication.
B. At this point in the cell cycle, chromosomes have properly aligned on the metaphase plate and are beginning to separate.
C. At this point in the cell cycle, DNA has already been replicated correctly and the cell is preparing for mitosis.
D. At this point in the cycle the cell is determining if environmental conditions are favorable for growth and proliferation.
E. At this point in the cycle the cell is continuing to grow and make abundant tubulin proteins.
Your community has a wonderful lake as a recreational resource. The water is relatively clear, nuisance algae are minimal, and the fishing is great. Swimming is one of the many popular activities in this clean water. Devise a community plan that will protect the water quality of your lake and protect against an algal bloom (a thick growth of algae)
What will be an ideal response?
Which enzyme is responsible for integration of a temperate phage into a host genome?
A) ?-galactosidase B) transposase C) integrase D) transacetylase E) permease