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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

  1. 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. 

  2. 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.

  3. A dominant active (constant activity) GEF causes stimulation of the effector protein for longer upon ligand-induced activation of the receptor.

  4. A dominant negative (no activity) GEF causes stimulation of the effector protein for longer upon ligand-induced activation of the receptor.

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TLS Online TPP Program

#Question id: 19701

#Unit 13. Methods in Biology

Choose correct statement about Electrocardiogram Augmented Limb Leads.
a. In this type of limb lead system, two of the limbs are connected through the positive terminal of the electrocardiograph, and the third limb is connected to the negative terminal. 
b. In this type of limb lead system, two of the limbs are connected through the negative terminal of the electrocardiograph, and the third limb is connected to the positive terminal. 
c. When the positive terminal is on the right arm, the lead is known as the aVR lead; when on the left arm, it is known as the aVL lead; and when on the left leg, it is known as the aVF lead.
d. When the negative terminal is on the right arm, the lead is known as the aVR lead; when on the left arm, it is known as the aVL lead; and when on the left leg, it is known as the aVF lead.
Which of the following combination is correct?
TLS Online TPP Program

#Question id: 19702

#Unit 13. Methods in Biology

What is aVL in augmented unipolar limb lead?
TLS Online TPP Program

#Question id: 19703

#Unit 13. Methods in Biology

What is aVR in augmented unipolar limb lead?
TLS Online TPP Program

#Question id: 19704

#Unit 13. Methods in Biology

What is aVF in augmented unipolar limb lead?
TLS Online TPP Program

#Question id: 19705

#Unit 13. Methods in Biology

Which of the following normally has a slowly depolarizing “prepotential”?
TLS Online TPP Program

#Question id: 19706

#Unit 13. Methods in Biology

In second-degree heart block