The cells of  posterior marginal zone act as the equivalent of the amphibian Nieuwkoop center because:

A. once the PMZ has formed, it controls the other regions of the margin.

B. Cells of PMZ initiate other regions of the margin from forming their own primitive streaks.

C. the entire marginal zone produces Wnt8c (capable of inducing the accumulation of -catenin) and secrete Vg1, a member of the TGF-family.

D. The PMZ cells secretes nodal protein and Nodal activity is needed to initiate the primitive streak.

E. When placed in the anterior region of the marginal zone, a graft of PMZ tissue (posterior to and including Koller’s sickle) is able to induce wnt signaling.

Which of the following option is correct?

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#Question id: 24650

#Unit 10. Ecological Principles

Determine the correctness of the following given; 

I-fundamental niche and 

II-realized niche

a. Actual range of an organism in nature

b. Biotic factors 

c. Abiotic factors

d. Abundant range of an organism 

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#Question id: 4669

#Unit 3. Fundamental Processes

Instead of a TATA box, some eukaryotic genes contain an alternative promoter element called an initiator. Most naturally occurring initiator elements have

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#Question id: 29547

#Unit 6. System Physiology – Plant

Fusicoccum amygdali produces the toxin fusicoccin, which constitutively activates the plasma membrane ____

TLS Online TPP Program

#Question id: 15175

#Unit 2. Cellular Organization

The cell membranes of psychrophilic microorganisms have high levels of _______ and remain semifluid when cold.

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#Question id: 1695

#Unit 4. Cell Communication and Cell Signaling

The processed peptide binding to the MHC class I groove: