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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Given what you now know, what information is most likely to produce the correct answer?
What will be an ideal response?
Filaments of a fungus that form a velvety cloak around roots or penetrate their cells aiding in the mutualistic
relationship between the plant and fungus are called ____. a. hyphae b. mycorrhizae c. root nodules d. root hairs e. Rhizobium
Four of the five animals listed below are ruminants
Select the exception. a. deer b. cattle c. antelopes d. goats e. bears
Which piece of evidence BEST supports the "multiregional evolution" model of the evolution of modern humans?
A) Molecular clocks date the last common ancestor of modern humans to about 171,500 years ago. B) Present-day human populations from Africa have greater genetic diversity than non-African populations. C) African Homo ergaster/erectus appear almost simultaneously with Asian Homo erectus, 1.6 to 1.9 million years ago. D) Both Asian fossil Homo erectus and modern Asian human populations show a high frequency of shovel-shaped incisors. E) There is no solid evidence supporting the multiregional hypothesis.