Which of the following has not yet been synthesized in laboratory experiments studying the origin of life?

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#Question id: 6997

#SCPH28 | Zoology

Hans Spemann and colleagues developed the concept of the "organizer" in amphibian embryos while studying the ________.

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#Question id: 5544

#SCPH06 I Botany

Which embryonic membrane forms the commonly of the placenta?

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#Question id: 3551

#SCPH01 Biochemistry

In angiosperm plant, assume that the male parent has an AA Bb genotype, and that the female parent has an aa BB genotype. What is genotype in endosperm nucleus, after reproduction between these two plants?

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#Question id: 1639

#SCPH01 Biochemistry

T-cell surface receptors for antigen partly recognize:

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#Question id: 10516

#SCPH06 I Botany

Which one are consistent with an important defense-activating role in the regulation of antiherbivore defense mechanisms in plants.