Practice Questions

TLS Online TPP Program

#Question id: 1244

Which type of experimental evidence shows that the intrinsic GTPase activity of the Gα subunit is important for terminating effector activation?

#Unit 4. Cell Communication and Cell Signaling

A nonhydrolyzable GTP analog that can bind to the Gα subunit but cannot be hydrolyzed by the intrinsic GTPase, thereby activating the effector protein longer upon ligand-induced activation of the receptor.
A nonhydrolyzable GTP analog causes displacement of GDP with the modified GTP resulting in continuous activation of the receptor because the bound GTP analog cannot be hydrolyzed to GDP.
A dominant active (constant activity) GEF causes stimulation of the effector protein for longer upon ligand-induced activation of the receptor.
A dominant negative (no activity) GEF causes stimulation of the effector protein for longer upon ligand-induced activation of the receptor.

More Questions

#Question id: 3643

#Unit 3. Fundamental Processes

One DNA strand, the______________, is made continuously in a 5→3 direction from the origin.

#Question id: 766

#Unit 1. Molecules and their Interaction Relevant to Biology

With respect to microRNAs, which, if any, of the following statements, is true?

#Question id: 2876

#Unit 2. Cellular Organization

From the following set of statements regarding DNA topology, state whether each of the given statement is either True or False.

A. The two strands of cccDNA can be easily separated without any breakage of bonds.

B. Circular DNA molecules purified from bacteria and eukaryotes are usually negatively supercoiled.

C. Interwound writhe and spiral writhe are topologically different.

D. The organisms that live under extreme temperature conditions have been found to have positively supercoiled DNA.

E. Negative supercoils can be thought of as a store of free energy that aids in processes that require strand separation.

#Question id: 11533

#Unit 6. System Physiology – Plant

IAA biosynthesis is associated with__

#Question id: 12002

#Unit 10. Ecological Principles