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TLS Online TPP Program

#Question id: 14766

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

#Unit 2. Cellular Organization
  1. The NPF WASp is inactive due to an intramolecular interaction that masks the WCA domain. 
  2. NPF WASp is activated by a coincidence detection mechanism, it must bind both the regulatory phospholipid PI(4,5)P2 though its basic domain (B) and the membrane-bound active small G protein Cdc42-GTP through its Rho-binding domain. 
  3. When activated by the Cdc42-GTP, the intramolecular interaction in WASp is relieved, allowing the W domain to bind actin and the acidic A domain to activate the Arp2/3 complex.
  4. The Arp2/3 branch makes a characteristic 70° angle between the old and new filaments.
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TLS Online TPP Program

#Question id: 12778

#Unit 10. Ecological Principles

A population of white-footed mice becomes severely overpopulated in a habitat that has been disturbed by human activity. Sometimes intrinsic factors cause the population to increase in mortality and lower reproduction rates in reaction to the stress of overpopulation. Which of the following is an example of intrinsic population control?
TLS Online TPP Program

#Question id: 12978

#Unit 10. Ecological Principles

Why is territoriality an adaptive behavior for songbirds maintaining populations at or near their carrying capacity? 
TLS Online TPP Program

#Question id: 12979

#Unit 10. Ecological Principles

Consider several human populations  of  equal size  and  net  reproductive rate, but  different in  age  structure. The population that is likely to grow the most during the next 30 years is the one with the greatest fraction of people in which age range?
TLS Online TPP Program

#Question id: 12980

#Unit 10. Ecological Principles

The following questions refer to Figure which depicts the age structure of three populations.

Which population is in the process of decreasing?

TLS Online TPP Program

#Question id: 12981

#Unit 10. Ecological Principles

The following questions refer to Figure which depicts the age structure of three populations.

Which population appears to be stable?

TLS Online TPP Program

#Question id: 12982

#Unit 10. Ecological Principles

The following questions refer to Figure which depicts the age structure of three populations.

Assuming these age-structure diagrams describe human populations, in which population is unemployment likely to be a societal issue in the future?