Describe the cancer stem cell hypothesis. How might this explain the inability of traditional cancer treatments such as radiation and chemotherapy to completely eradicate tumors?
What will be an ideal response?
The cancer stem cell hypothesis suggests that only certain cells in a tumor are capable of continual cell division and initiating the growth of new tumors. Traditional cancer therapies have focused on killing the rapidly dividing cancer cells (progenitor cells) but may not target cancer stem cells. Thus, although death of progenitor cells would shrink the tumor, cancer stem cells could replenish the population, causing the tumor to return.
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Which of the following is not part of the process by which an endospore transforms to become a vegetative cell?
A. Germination B. Outgrowth C. Induction D. Activation
How does x-ray crystallography provide details about molecular structure?
a. Only DNA molecules scatter x-rays; therefore, this helped to prove that DNA was the genetic material in cells. b. X-rays are reflected by some atoms and absorbed by others; thereby giving clues to molecule structure. c. X-rays are scattered by atoms in a specific pattern, from which molecular size, shape, and spacing of repeating elements can be calculated. d. This technique captures photographs of magnified molecules. e. X-rays can be used to isolate DNA molecules from living organisms.
What is the most inclusive level of the hierarchial classification scheme?
A. domain B. phylum C. kingdom D. genus E. species
In deuterostomes the blastopore develops into the mouth
____________________ Indicate whether the statement is true or false.