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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: 5356

#Unit 8. Inheritance Biology

In the following pedigree, individuals with shaded circle or shaded square show presence of a recessive autosomal trait. The calculated risk of occurrence of this trait for III-I is
TLS Online TPP Program

#Question id: 15120

#Unit 8. Inheritance Biology

Given below is a pedigree chart showing the inheritance of a certain sex-linked trait in humans 

The trait traced in the above pedigree chart is
TLS Online TPP Program

#Question id: 15119

#Unit 8. Inheritance Biology

identify the pedigree shown below 
TLS Online TPP Program

#Question id: 15118

#Unit 8. Inheritance Biology

In dominant disorder only normal/affected individuals are appeared in population then what will be the correct expression of Hardy-Weinberg principle
TLS Online TPP Program

#Question id: 15117

#Unit 8. Inheritance Biology

In any population of 10000, in which 100 females were affected from x-linked recessive disorder. What will be the carrier frequency for this x-linked recessive disorder.
TLS Online TPP Program

#Question id: 15005

#Unit 8. Inheritance Biology

You identify a previously unidentified plant species and decide to study its genetics. You establish true breeding strains for leaf shape (longer than wide vs equal length and width) and flower color (white vs. yellow). When you perform a dihybrid cross with these strains, you find that your results are very different than those predicted by a 9:3:3:1 ratio. You calculate a chi square and get a p value of less than 0.0001. Which of the following statements is most accurate based on this observation?