Practice Questions

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

The NPF WASp is inactive due to an intramolecular interaction that masks the WCA domain.
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.
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.
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: 12477

#Unit 10. Ecological Principles

A table listing such items as age, observed number of organisms alive each year, and life expectancy is known as a (an)

TLS Online TPP Program

#Question id: 12478

#Unit 10. Ecological Principles

Life tables are most useful in determining which of the following?

TLS Online TPP Program

#Question id: 12479

#Unit 10. Ecological Principles

Use the survivorship curves in Figure to answer the following questions

Which curve best describes survivorship in marine mollusks?

TLS Online TPP Program

#Question id: 12533

#Unit 10. Ecological Principles

If the flow of energy in an arctic ecosystem goes through a simple food chain, perhaps involving humans, starts from seaweeds to fish to seals to polar bears, then which of the following could be true?

TLS Online TPP Program

#Question id: 12534

#Unit 10. Ecological Principles

Which of the following statements is correct about biogeochemical cycling?

TLS Online TPP Program

#Question id: 12535

#Unit 10. Ecological Principles

If you were tracking a nutrient molecule through an ecosystem, which of the following statements would you expect to verify?