#Question id: 1504
#Unit 4. Cell Communication and Cell Signaling
Tumor-suppressor genes usually act as .......... genes, and oncogenes usually act as ........... genes.
#Question id: 1505
#Unit 4. Cell Communication and Cell Signaling
Which of the following types of genes have not been identified as oncogenes?
#Question id: 1506
#Unit 4. Cell Communication and Cell Signaling
An oncogene codes for a growth factor receptor that is constitutively active. Of the following statements about a culture of cells expressing this gene, which would you expect to be true?
#Question id: 1507
#Unit 4. Cell Communication and Cell Signaling
The genes responsible for cancer in RNA and DNA tumor viruses are:
#Question id: 1508
#Unit 4. Cell Communication and Cell Signaling
Of the following statements explaining how alterations of the ras gene cause cancer, which is true?
#Question id: 1509
#Unit 4. Cell Communication and Cell Signaling
Cells that are infected, damaged, or have reached the end of their functional life span often undergo "programmed cell death." This controlled cell suicide is called apoptosis. Select the appropriate description of this event on a cell's life cycle.