Explain how apoptosis can protect the body against cancerous cells. What will be an ideal response?
Apoptosis, or programmed cell death, rids the body of aging cells. Cancerous cells are able to
resist apoptosis; therefore, they are able to persist in the body.
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One of your closest fish relatives is the coelacanth. Where is its equivalent to your forearm?
A. The claspers B. The pectoral fin lobe C. The operculum D. The gill arch extensions E. The pelvic fin lobe Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about the coelacanths? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Which statement best describes the gametes of most animals?
a. A sperm is large and motile; an egg is small and nonmotile. b. A sperm is small and nonmotile; an egg is large and motile. c. A sperm is large and nonmotile; an egg is small and motile. d. A sperm is small and motile; an egg is large and nonmotile. e. The sperm and egg are about the same size, but only the sperm is motile.
The hundreds of species of Drosophila in Hawaii exhibit different mating rituals. This isolating mechanism is
A. prezygotic and temporal. B. prezygotic and behavioral. C. prezygotic and geographical. D. prezygotic and ecological. E. postzygotic and mechanical.
Hfr transfer involves all of the following except
A. a pilus connection between F+ and F- cells. B. plasmid gene transfer. C. F factor is part of the F+ donor chromosome. D. high frequency transfer. E. gene integration into the bacterial chromosome.