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TLS Online TPP Program

#Question id: 4995

It has been found that certain proteins of the complex motor that drives bacterial flagella are modified versions of proteins that had previously belonged to plasma membrane pumps. This is evidence in support of the claim that

#Unit 11. Evolution and Behavior

  1. some structures are so complex that natural selection cannot, and will not, explain their origins.

  2. the power of natural selection allows it to act in an almost predictive fashion, producing organs that will be needed in future environments.

  3. the motors of bacterial flagella were originally synthesized abiotically.

  4. natural selection can produce new structures by cobbling together parts of other structures.

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TLS Online TPP Program

#Question id: 23830

#Unit 2. Cellular Organization

The first myosin isolated from skeletal muscle;
TLS Online TPP Program

#Question id: 23829

#Unit 2. Cellular Organization

Myosins don’t have 
TLS Online TPP Program

#Question id: 23798

#Unit 2. Cellular Organization

Myosin is
TLS Online TPP Program

#Question id: 14766

#Unit 2. Cellular Organization

Which of the following statements does not belongs to the regulatory mechanism of the Arp2/3 complex by WASp and PI(4,5)P2?
TLS Online TPP Program

#Question id: 14765

#Unit 2. Cellular Organization

Following statements are regarding to the formins which involve in filament assembly.
A. All formin family members have two adjacent domains in common, the so called FH1 and FH2 domains (formin-homology domains 1 and 2).
B. Two FH2 domains from two individual formin monomers associate to form a doughnut-shaped complex can form a dimer and nucleate filament assembly.
C. The FH1 domain of formin is rich in proline residues, which serve as sites for the binding of several profilin molecules.
D. The FH2 domain behaves as a landing site for profilin–ATP–G-actin to increase the local concentration of these complexes.
E. Formins are activated by membrane bound Rho-GTP, a Ras-related small GTPase.
Which of the following combination is correct?
TLS Online TPP Program

#Question id: 14764

#Unit 2. Cellular Organization

Match the following proteins (Column I) with their function (Column II). Which of the following is correct?

Column I

Column II

a. Profilin

i. binds to the (+) end of an actin filament, thereby inhibiting subunit addition or loss.

 

b. Cofilin

ii. blocks (−) ends, inhibits filament disassembly, to stabilize filaments

c. Thymosin-β4

iii. involved in actin treadmilling, but it binds specifically to F-actin in which the subunits contain ADP

d. Cap Z

iv. binds ADP–G-actin and catalyzes the exchange of ADP for ATP

e. Tropomodulin

v. binds to ATP–G-actin in such a way that it inhibits addition of the actin subunit to either end of the filament.