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TLS Online TPP Program

#Question id: 4458

What structural changes will occur at the time of transition to the open complex and  how we describe this transition in transcription,

#Unit 3. Fundamental Processes

  1. Melting occurs between positions –11 and +2, with respect to the transcription start site.

  2. In the case of the bacterial enzyme bearing s70, this transition, often called isomerization.

  3. It requires energy derived from ATP hydrolysis and is instead the result of a nonspontaneous conformational change in the DNA– enzyme complex to a more energetically favorable form.

  4. Only A and B

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TLS Online TPP Program

#Question id: 2435

#Unit 2. Cellular Organization

The structural and functional unit of skeletal muscle is the
TLS Online TPP Program

#Question id: 2436

#Unit 2. Cellular Organization

Cell locomotion

a. requires coordination of motions generated in different regions of the cell.

b. occurs only in cells with a defined polarity.

c. may be controlled by signaling pathways.

d. occurs in a defined sequence of steps.
TLS Online TPP Program

#Question id: 2437

#Unit 2. Cellular Organization

Membrane extension involves

a. bending actin filaments.                   

b. myosin II.

c. the Arp2/3 nucleation of new filaments.

d. actin depolymerization.     

e. actin polymerization.
TLS Online TPP Program

#Question id: 2438

#Unit 2. Cellular Organization

Rac, a GTPase superfamily protein,

a. is related to Ras.                             

b. may be activated by growth factors.

c. stimulates lamellipodia formation. 

d. stimulates filopodia formation.

e. stimulates stress fiber assembly.
TLS Online TPP Program

#Question id: 2439

#Unit 2. Cellular Organization

α- and β-tubulin

a. are highly conserved.                                 

b. bind GTP.

c. hydrolyze GTP to GDP.                 

d. are found in all eukaryotes.

e. are related to the bacterial protein FtsZ.
TLS Online TPP Program

#Question id: 2440

#Unit 2. Cellular Organization

Microtubule assembly in vitro requires

a. ATP.                                                           

b. a threshold (critical) concentration of tubulin.

c. warming the solution to 37°C.                   

d. microtubule-associated proteins.         

e. GTP.