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TLS Online TPP Program

#Question id: 807

Which of the following forces can stabilize a normal DNA double-helix?

#Unit 1. Molecules and their Interaction Relevant to Biology

  1. Base-stacking is a non-covalent interaction that occurs between the relatively hydrophobic bases in the interior of the helix.

  2. Base-pairing is a non-covalent interaction that occurs between adjacent bases in the same strand of the DNA molecule.

  3. The hydrophilic sugar-phosphate groups are on the exterior of the helix where they can interact with each other.

  4. The deoxyribose rings form N-glycosidic bonds with the phosphate groups that link neighboring nucleotides.

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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