Match the following proteins (column A) with their functions (column B) during cell organization and movement;

 

Column A	Column B
I- Profilin	(a) F-actin disassembly
II- Cofilin	(b) depolymerizes actin filaments by binding to the (-) end of F-actin
III- Thymosin B-4	(c) G-actin nucleotide exchange (ADP to ATP)
	(d) G-actin monomer sequestering

TLS Online TPP Program

#Question id: 2470

#Unit 2. Cellular Organization

The elastic Brownian ratchet model has been proposed to explain:

TLS Online TPP Program

#Question id: 2471

#Unit 2. Cellular Organization

Small G proteins, including Rho, Rac, and Cdc42, contribute to the coordinated movement and overall polarity of a migrating cell.  Assuming that the cell is migrating in a left-to-right fashion, which of the following is correct?

TLS Online TPP Program

#Question id: 2472

#Unit 2. Cellular Organization

In response to a chemotactic signal, a cell forms structures to aid in locomotion. In lamellipodia, active Rac will stimulate F-actin polymerization at the leading edge via _____, whereas actin that will form stress fibers will be recruited by formin downstream of activation of this small GTPase _____.

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#Question id: 2473

#Unit 2. Cellular Organization

A microtubule protofilament is formed by the:

TLS Online TPP Program

#Question id: 2474

#Unit 2. Cellular Organization

 In cells, the gamma-tubulin ring complex is found:

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#Question id: 2475

#Unit 2. Cellular Organization

What is a microtubule protofilament?