What is the purpose of the chorion in terrestrial vertebrate embryos?

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#Question id: 10759

#Unit 6. System Physiology – Plant

many secondary metabolites have been suggested to have important ecological functions in plants:

a) they protect plants against being eaten by herbivores (herbivory)

b) they protect plants against being infected by microbial pathogens

c) they serve as attractants for pollinators and seed dispersing animals

d) they serve as agents of plant–plant competition

Which of the following combination from above statements is correct?

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#Question id: 19190

#Unit 13. Methods in Biology

Emulsion or droplet PCR is another modification of PCR. Which of the statement holds true?

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#Question id: 28280

#Unit 5. Developmental Biology

 Species specific recognition of sea urchin gametes can occur at the various level such as____ 

a) sperm attraction 

b) sperm activation

c) the acrosome reaction

d) sperm adhesion

e) Cortical Granules reaction

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#Question id: 1284

#Unit 4. Cell Communication and Cell Signaling

The collagen triple-helix domain is NOT:

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#Question id: 11371

#Unit 9. Diversity of Life Forms

Which statement about gram-negative bacteria is correct?