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TLS Online TPP Program

#Question id: 9168

Which of the following statements best describes the interaction between fire and ecosystems?

#Unit 9. Diversity of Life Forms

  1. The likelihood of a wildfire occurring in a given ecosystem is highly predictable over the short term.

  2. Many kinds of plants and plant communities have adapted to frequent fires.

  3. The suppression of forest fires by humans has prevented certain communities, such as grasslands, from reaching their climax stage.

  4. Chaparral communities have evolved to the extent that they rarely burn
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TLS Online TPP Program

#Question id: 1405

#Unit 4. Cell Communication and Cell Signaling

A gain-of-function mutation in which of the following would have the same effect as a gain-of-function mutation in Ras?
TLS Online TPP Program

#Question id: 1406

#Unit 4. Cell Communication and Cell Signaling

Which of the following is a consequence of p53 stabilization?

a. stabilization of Cdc25A      b. activation of ATM                c. blocked apoptosis

d. transcription of p21                        e. DNA repair
TLS Online TPP Program

#Question id: 1407

#Unit 4. Cell Communication and Cell Signaling

Which of the following is pro-apoptotic?

a. Bax              b. Bcl-2                       c. p53              d. protein kinase B      e. PTEN
TLS Online TPP Program

#Question id: 1409

#Unit 4. Cell Communication and Cell Signaling

Which DNA repair system is affected in patients with xeroderma pigmentosum?
TLS Online TPP Program

#Question id: 1410

#Unit 4. Cell Communication and Cell Signaling

The number of alterations in DNA per cell per day is
TLS Online TPP Program

#Question id: 1411

#Unit 4. Cell Communication and Cell Signaling

A gain-of-function mutation in telomerase causes which of the following?