During gastrulation in Xenopus, the future mesoderm and endoderm move inside the embryo through the "blastopore"; in contrast, in chickens, gastrulation involves cells moving inward through the:

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#Question id: 18925

#Unit 13. Methods in Biology

How can it be determined that a DNA molecule is cleaved by the action of endonuclease?

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#Question id: 10700

#Unit 10. Ecological Principles

Which of the following most important conclusion from the graph?

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#Question id: 24271

#Unit 4. Cell Communication and Cell Signaling

Integrins are involved in following processes, except:

a. Extravasation

b. Cell-to-cell adhesion

c. Cell migration

d. Receptors for certain viruses

e. Angiogenesis

f. Apoptosis

g. Necroptosis

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#Question id: 4991

#Unit 11. Evolution and Behavior

Which of these fly organs, as they exist in current fly populations, best fits the description of an exaptation?

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#Question id: 11647

#Unit 7. System Physiology – Animal

After menopause, hormone replacement therapy with estrogen-like compounds is effective in preventing the progression of osteoporosis. What is the mechanism of their protective effect?