Following statements are regarding to anterior-posterior polarity in planaria.

A. The anterior expression of Notum functions to antagonize the posteriorly produced Wnt, leading to head specification.

B. Regulation of the balance between Wnt and Notum signals may underlie not only head-tail specification but also regulation of organ size.

C. In addition, there appears to be an anterior-to-posterior gradient of Erk signaling that functions as a positive inducer of tail specification.

D. Wnt signaling achieves its repression of head regeneration by inhibiting Erk. Therefore, only in those more anterior regions lacking Wnt (due to Notum’s repression of Wnt) can Erk induce head regeneration.

Which of the following statements are incorrect?

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#Question id: 27095

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following is correct regarding the Type I β turn positions  Ramachandran plot

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#Question id: 27096

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following is incorrect regarding the Type II β turns

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#Question id: 27097

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following is correct regarding the β turns

(1) In Type I β turn i+1 lies in RHH region while i+2 lies near BS region

(2) In Type II β turn i+1 lies in BS while i+2 lies in below LHH

(3) In Type I’ β i+1and i+2 in near LHH which virtually not allowed region for most of amino acid except Gly

(4) In Type II’ β i+2 lies at 00 psi and i+1 in lower right region both i+2 and   i+1  must be Gly

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#Question id: 27098

#Unit 1. Molecules and their Interaction Relevant to Biology

On what positions Beta turns are characterised

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#Question id: 27099

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following statement is wrong regarding the α -Turn

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#Question id: 27100

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following statement is correct regarding the α -Turn and β turns

(1)In α - Turn H-bond is seen between i and i + 4 (First and Fifth residue)

(2) In α Turn conformation is based on i + 1 , i + 2 and i + 3 on the basis of this, they are classified

(3)In β turns H-bond is seen between i and i + 4 (First and Fifth residue)

(4) In β turns  conformation of i + 1 and i + 2 are crucial and on the basis of this, they are classified