TLS Online TPP Program

#Question id: 20330


What does the LuxR gene do?

#Unit 4. Cell Communication and Cell Signaling
  1. an repressor protein that is terminate the transcription when it is in a complex with its ligand AHL
  2. an activator protein that is only able to turn on transcription when it is in a complex with its ligand S-adenosylmethionine (SAM)
  3. an activator protein that is only able to turn on transcription when it is in a complex with its ligand AHL
  4. an repressor protein that is terminate the transcription when it is in a complex with its ligand S-adenosylmethionine (SAM)
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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?