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TLS Online TPP Program

#Question id: 7283

The Drosophila orthodenticle gene and the vertebrate Otx genes are homologous and provide a good example of the conservation of gene function during evolution. Which of the following statement is correct regarding to the expression of gene expression.

#Unit 5. Developmental Biology
  1. Orthodenticle is expressed in the posterior region of the future Drosophila brain. In mice, Otx1 and Otx2 are expressed in overlapping domains in the developing forebrain and midbrain.
  2. Orthodenticle is expressed in the anterior region of the future Drosophila brain. In mice, Otx is expressed in overlapping domains in the developing forebrain.
  3. Orthodenticle is expressed in the posterior region of the future Drosophila brain. In mice, Otx1 and Otx2 are expressed in the developing limb.
  4. Orthodenticle is expressed in the proximal region of the future Drosophila limb. In mice, Otx1 and Otx2 are expressed in the developing limb.
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TLS Online TPP Program

#Question id: 27071

#Unit 1. Molecules and their Interaction Relevant to Biology

Bond forces and their strength are given match them correctly 

 Force Strength (kJ/mol) 
 1. Van der Waals interactions a. <40
 2. Hydrogen bonds b. 20
 3. Ionic interactions c. 12–30
 4. Hydrophobic interactions d. 0.4–4.0
TLS Online TPP Program

#Question id: 823

#Unit 1. Molecules and their Interaction Relevant to Biology

chaotropic agents such as guanidinium ion and urea, the efficiency of the chaotropic agent is measured in terms of-
TLS Online TPP Program

#Question id: 13001

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following is incorrect 
a) antiparallel β sheets are frequently found and they are quite more stable because of more no. hydrogen bond presence and linear H bonding pattern.
b) antiparallel β sheets are frequently found and they are quite more stable because of more no. hydrogen bond presence and having distorted H bonding pattern.
c) parallel β sheets are relatively less stable and mostly found in core of protein.
d) parallel β sheets are relatively more stable and mostly found in core of protein.
TLS Online TPP Program

#Question id: 13000

#Unit 1. Molecules and their Interaction Relevant to Biology

Identify the correct statement regarding the structure
TLS Online TPP Program

#Question id: 12999

#Unit 1. Molecules and their Interaction Relevant to Biology

Proline and glycine both disturb the symmetry of α-helix which of the following are true regarding to these two amino acids
a) proline changes the orientation of hetropolymeric α-helix hence proline can be placed only as 1st amino acid residue near to C-terminus 
b) proline changes the orientation of polymeric α-helix hence proline can be placed only as 1st amino acid residue near to N-terminus
c) glycine disrupts the heteropolymeric α-helix by changing the helicity.
d) homopolymer of proline and glycine can form stable helix. 
TLS Online TPP Program

#Question id: 12998

#Unit 1. Molecules and their Interaction Relevant to Biology

Match with appropriate bonding pattern

Helix typeHydrogen bonding
a. α-helix1. n, n+3
b. 310 helix2. n, n+5
c. π helix3. n, n+4