The regeneration blastema forms from pluripotent stem cells called clonogenic neoblast. If cNeoblasts are essential for regeneration, their total loss should prevent regeneration. Following statements are made in respect to planaria regeneration are given below.

(A) The gene sigma/zeta is expressed by all neoblasts and has become the most common marker for their identification across planarian species.

(B)   In planaria, Wnt/β-catenin functions to establish dorsal ventral polarity of the regenerating flatworm.

(C)   Inhibition of Wnt/β-catenin signaling in regeneration-deficient species yields fully functional regenerated heads.

(D)   If β-catenin is eliminated from the posterior (tail-forming) blastema by RNA interference, that blastema will form a tail.

Which of the above statements are true?

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#Question id: 1365

#Unit 4. Cell Communication and Cell Signaling

Which of the following best describes the structure of integrins?

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#Question id: 7472

#General Aptitude

What will be the angle between the hour and minute hands at 12 : 10?

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#Question id: 33461

#Unit 1. Molecules and their Interaction Relevant to Biology

Which positions in the purine ring of a purine nucleotide in DNA have the potential to form hydrogen bonds but are not involved in Watson-Crick base pairing?

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#Question id: 11527

#Unit 6. System Physiology – Plant

Coleoptiles are very sensitive to light, if illuminated on one side with a short pulse of dim blue light, it will

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#Question id: 27922

#Unit 11. Evolution and Behavior

Lamarck hypothesized that different organisms originated separately by______I_________and gives a principle_______II_______.

a) spontaneous generation from nonliving matter

b) inheritance of acquired character

c) means of Natural Selection

d) Uniformitarianism

e) Spontaneous generation from living matter