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TLS Online TPP Program

#Question id: 801

Identify the type of DNA from the structures given below and match the correct form with its characteristics described.

#Unit 1. Molecules and their Interaction Relevant to Biology

  1. (ii) – The more compact A form of DNA has 11 bp per turn and shows a large tilt of the base pairs with respect to the helix axis.

  2. (i) – The B form, which is observed at high humidity, most closely corresponds to the average structure of DNA under physiological conditions.

  3. (iii) – Z DNA is a left-handed helix and has a zigzag (hence “Z”) appearance and has an anti-conformation of glycosyl bond.

  4. (i) – The A form which is observed under low humidity has a structure similar to the structure that RNA adopts when double-helical.

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TLS Online TPP Program

#Question id: 12991

#Unit 1. Molecules and their Interaction Relevant to Biology

Choose the correct statements
a. Secondary structures are stabilized by hydrogen bonds.
b. Hydrogen bond always formed between non bonded atoms.
c. the folded length of an amino acid in α-helix reduced almost 3 times than linear structure.
d. Only dihedral angle changes during the formation of secondary structure while bond length remains unchanged
TLS Online TPP Program

#Question id: 12990

#Unit 1. Molecules and their Interaction Relevant to Biology

Choose the incorrect statement related to ionic interactions
a. Ionic interactions takes place between positively and negatively charged amino acids side chain.
b. Ionic interactions takes place between positively and positively charged amino acids side chain.
c. ionic interaction has almost 20 kj/mol of bond energy.
d. ionic interaction is weak interaction that have lowest 20kj/mol of bond energy.
e. strength of ionic bond within protein chain calculated by
 
TLS Online TPP Program

#Question id: 12989

#Unit 1. Molecules and their Interaction Relevant to Biology

Choose the correct statement related to hydrogen bond and Van der Waals interactions
a. Hydrogen bond formation takes place between dipole-dipole interaction.
b. Van der waals interaction takes place between induced dipole-induced dipole.
c. Hydrogen bond formation takes place between induced dipole-induced dipole.
d. Van der waals interaction takes place between dipole-dipole interaction.
TLS Online TPP Program

#Question id: 341

#Unit 1. Molecules and their Interaction Relevant to Biology

 Which force can stabilize a DNA double-helix?
TLS Online TPP Program

#Question id: 339

#Unit 1. Molecules and their Interaction Relevant to Biology

The edges of each base pair are exposed in the major and minor grooves, creating a pattern of hydrogen-bond donors and acceptors and of hydrophobic groups (allowing for Vander Waals interactions) that identifies the base pair. The edge of an C : G base pair displays the following chemical groups in the following order in the major groove:
TLS Online TPP Program

#Question id: 338

#Unit 1. Molecules and their Interaction Relevant to Biology

What is the difference between covalent bonds and ionic bonds?