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TLS Online TPP Program

#Question id: 718

Poly- L -leucine in an organic solvent such as dioxane is a helical, whereas poly- L isoleucine is not. Why do these amino acids with the same number and kinds of atoms have different helix-forming tendencies?

#Unit 1. Molecules and their Interaction Relevant to Biology

  1. Leucine has bulky side chain than isoleucine so it forms helix.

  2. Methyl group at γ position of isoleucine cause stearic hindrance and blocks helix formation tendency

  3. Due to the stearic hindrance caused by β carbon- methyl group, isoleucine can’t form helix. Methyl group at γ position of isoleucine cause stearic hindrance and blocks helix formation tendency.

  4. Isoleucine has chiral carbon due to which it can,t form poly-L isoleucine helix.

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TLS Online TPP Program

#Question id: 28384

#Unit 5. Developmental Biology

Location of the involuting marginal zone cells of amphibian gastrulation is called___
TLS Online TPP Program

#Question id: 1951

#Unit 4. Cell Communication and Cell Signaling

A therapeutic approach in rheumatoid arthritis (RA) is to:
TLS Online TPP Program

#Question id: 32244

#Unit 2. Cellular Organization

What is a suggested mechanism for retaining ER resident proteins in the ER?
TLS Online TPP Program

#Question id: 12824

#General Aptitude

The area of a rectangle is thrice that of a square. The length of the rectangle is 20 cm and the breadth of the rectangle is 3/2 times that of the side of the square. The side of the square (in cm) is
TLS Online TPP Program

#Question id: 1293

#Unit 4. Cell Communication and Cell Signaling

NCAMs, a group of cell-adhesion proteins belonging to the Ig superfamily. Which of the following is not a property of NCAM?