According to the Switching mechanism, monomeric G proteins exist in two states. Match the following states (Column I) with correct mechanism (Column II).

Column I	Column II
A. “ON” state	i. switch I and switch II, are bound to the terminal γ phosphate of GTP through interactions with the backbone amide groups of conserved threonine and glycine residues.
B. “OFF” state	ii. GTPase-activating proteins
	iii. guanine nucleotide exchange factor
	iv. Due to the removal of the γ phosphate by GTPase-catalyzed hydrolysis causes switch I and switch II to relax into a different conformation

TLS Online TPP Program

#Question id: 13183

#Unit 10. Ecological Principles

The MacArthur-Wilson equilibrium model of island biogeography predicts the number of species found on islands. The figure below depicts two volcanic islands located off a section of mainland coast.

According to the MacArthur-Wilson model, how would the number of bird species change from the time of an island's formation (assuming it remains constant in size and isolation)?

TLS Online TPP Program

#Question id: 13182

#Unit 10. Ecological Principles

The MacArthur-Wilson equilibrium model of island biogeography predicts the number of species found on islands. The figure below depicts two volcanic islands located off a section of mainland coast.

The MacArthur-Wilson model predicts that the relative numbers of bird species on the mainland and two islands would be

TLS Online TPP Program

#Question id: 13181

#Unit 10. Ecological Principles

Generally speaking, deserts are located in places where air masses are usually

TLS Online TPP Program

#Question id: 13180

#Unit 10. Ecological Principles

Which of the following is responsible for the summer and winter stratification of deep temperate lakes?

TLS Online TPP Program

#Question id: 13179

#Unit 10. Ecological Principles

In temperate lakes, the surface water is replenished with nutrients during turnovers that occur in the

TLS Online TPP Program

#Question id: 13178

#Unit 10. Ecological Principles

Turnover of water in temperate lakes during the spring and fall is made possible by which of the following?