Which of the following statements is true about formation of the primitive streak ?

A. by the cellular dance mechanism, the cells came down the sides of the epiblast to undergo a medially directed intercalation of cells in the posterior margin where primitive streak forms.

B. Cellular dance is mediated by wnt planar cell polarity pathway in the hypoblast cells, at the posterior edge of the embryo.

C. The Wnt pathway activated by fibroblast growth factors (FGFs) produced by the hypoblast.

D. The Wnt planar cell polarity pathway activated by b-catenin produced by the epiblast.

TLS Online TPP Program

#Question id: 10581

#Unit 10. Ecological Principles

Life-history characteristics associated with K-selected organisms include

TLS Online TPP Program

#Question id: 10547

#Unit 6. System Physiology – Plant

Which of the following responses are incorrect for closing of stomata?

TLS Online TPP Program

#Question id: 26788

#Unit 8. Inheritance Biology

Which of the following factors did not contribute to Mendel’s success in his study of heredity?

a.His use of the monoecious pea plant

b.His study of plant chromosome

c.His adoption of an experimental approach

d.His use of mathematics

e.The Plant use is easy to cultivate

TLS Online TPP Program

#Question id: 32334

#Unit 2. Cellular Organization

Which of the following actin binding protein binds monomers & concentrates them at sites of filament assembly?

TLS Online TPP Program

#Question id: 1929

#Unit 4. Cell Communication and Cell Signaling

Which of the following is an example of an immune escape mechanism used by some tumor cells?