In heart muscle, activation series of the muscarinic acetylcholine receptor its effector K+ channel via the Gβγ subunit of a Gi protein.

a. Binding of acetylcholine triggers activation of the Gαi subunit and its dissociation from the Gβγ subunit in the usual way. 

b. The released Gβγ subunit (rather than Gαi∙GTP) binds to and opens the associated effector protein, a K+ channel. 

b. The increase in K+ permeability hyperpolarizes the membrane, which reduces the frequency of heart muscle contraction. 

d. Activation is terminated when the GTP bound to Gαi is hydrolyzed (by a GAP enzyme that is an intrinsic part of the Gαi subunit) to GDP and Gαi∙GDP recombines with Gβγ.

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#Question id: 19994

#Unit 2. Cellular Organization

Quantification of reassociation/annealing of various part of DNA is called 

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#Question id: 3383

#Unit 11. Evolution and Behavior

What does the study of analogous organ tell us about evolution?

A. This is the example of convergent evolution, occurred due to different group of organisms inhabiting same environments

B- Evolutionary change follow common pathway in two or more distinct species

C- Different organism get adopted to one environment

D- Similar group of organisms with mutations and variations getting naturally selected in different environments 

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#Question id: 12674

#Unit 10. Ecological Principles

You  have  a  friend  who  is  wary  of  environmentalists? claims  that  global  warming  could  lead  to  major  biological change on Earth. Which of the following statements can you truthfully make in response to your friend's suspicions?

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#Question id: 23777

#Unit 7. System Physiology – Animal

The area over the optic disk, which lacks the visual receptors, is known as  

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#Question id: 2097

#Unit 2. Cellular Organization

Free and unesterified fatty acids bind to one of a number of chaperone proteins in order to be transported in the aqueous environment of the cytosol. Which of the following facilitates this intracellular transport?