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TLS Online TPP Program

#Question id: 7154

Cancer is believed to often arise from stem cells, rather than fully differentiated cells. Which of the following are consistent with this view?

#Unit 5. Developmental Biology
  1. Stem cells are actively dividing and express few differentiated functions, so they may have fewer changes to undergo than do fully differentiated cells in becoming cancer cells.
  2. DNA replication is necessary for mutations to occur, and stem cells are replicating their DNA whereas differentiated cells are for the most part not replicating their DNA.
  3. Teratocarcinomas are tumors that arise from germ cells or embryonic stem (ES) cells, under certain circumstances, demonstrating that tumors can arise from stem cells without further mutation.
  4. All of the above are reasons that cancer cells may more readily arise from stem cells than from fully differentiated cells.
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TLS Online TPP Program

#Question id: 5030

#Unit 9. Evolution & Diversity of Life Forms

There is evidence that ray-finned fishes originally evolved
TLS Online TPP Program

#Question id: 5031

#Unit 9. Evolution & Diversity of Life Forms

Which era is known as the ʺage of reptilesʺ?
TLS Online TPP Program

#Question id: 5032

#Unit 9. Evolution & Diversity of Life Forms

There is still some controversy among biologists about whether Neanderthals should be placed within the same species as modern humans, or into a separate species of their own. Most DNA sequence data analyzed so far indicate that there was probably little or no gene flow between Neanderthals and Homo sapiens. Which species concept is most applicable in this example?
TLS Online TPP Program

#Question id: 5033

#Unit 9. Evolution & Diversity of Life Forms

Which of the following statements is correct in regard to Homo erectus?
TLS Online TPP Program

#Question id: 5034

#Unit 9. Evolution & Diversity of Life Forms

Which of these statements about human evolution is correct?
TLS Online TPP Program

#Question id: 5035

#Unit 5. Developmental Biology

 A fertilized egg is called a: