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TLS Online TPP Program

#Question id: 13187

The following figure is a model of seedling establishment as a function of distance from a parent tree. Initial seed density measures the number of seeds falling to the ground. Seed survivorship measures the proportion of seeds that survive to the adult stage at each distance


Which of the following factors is most likely to generate the seed density curve shown? 

#Unit 10. Ecological Principles
  1. There are no effective seed dispersers of this tree species.
  2. Most seeds fall directly under the parent tree, but some are dispersed away from it. 
  3. The seeds are randomly dispersed by wind.

  4. Seed predation is lowest under the parent tree.

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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.

TLS Online TPP Program

#Question id: 14763

#Unit 2. Cellular Organization

Which of the following graph shows G-actin polymerize into F-actin.