Practice Questions

TLS Online TPP Program

#Question id: 9202

Which of the following statements regarding extinction is accurate?

#Unit 9. Diversity of Life Forms

A large percentage of species are immune from extinction; however, rates of extinction may increase with continued human impacts.
Extinctions occur only periodically, separated by long time spans with no extinctions.
Extinction is occurring at a similar rate now as compared to historical fossil evidence.
The small-population approach is inferior to the declining-population approach if the goal is to conserve the maximum number of species in a given region.

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TLS Online TPP Program

#Question id: 1403

#Unit 4. Cell Communication and Cell Signaling

Tumor-suppressor genes encode proteins with which of the following functions?

a. growth-promoting b. growth-arresting c. pro-apoptotic

d. anti-apoptotic e. DNA repair

TLS Online TPP Program

#Question id: 1404

#Unit 4. Cell Communication and Cell Signaling

Which of the following are transcription factors?

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?