which of the following cells synthesize the transcription factor Cdx2, which downregulates Oct4 and Nanog?

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#Question id: 28945

#Unit 7. System Physiology – Animal

Which of the following hormones is involved to promotes the mammary gland development and milk production?

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#Question id: 12440

#Unit 10. Ecological Principles

Tadpoles raised at high population densities _______ relative to those raised at lower population densities.

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#Question id: 7243

#Unit 5. Developmental Biology

Match the following:

Column I	Column II
A. Anterior necrotic zone	I. Rapid apoptosis that occurs when epithelial cells lose their attachment to the extracellular matrix.
B. Anoikis	II. Devoid of any neural innervation.
C. Aneurogenic	III. Mammalian equivalent to the chick hypoblast and similar to the head portion of the amphibian organizer, it creates an anterior region by secreting antagonists of Nodal.
D. Anterior visceral endoderm	IV. A zone of programmed cell death on the anterior side of the developing tetrapod limb that helps shape the limb.

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#Question id: 5615

#Unit 5. Developmental Biology

The fast block to polyspermy is achieved by:

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#Question id: 12271

#Unit 7. System Physiology – Animal

A young woman comes to the emergency room with a vertebral compression fracture. Radiographs of the spine indicate generalized demineralization. She is vegetarian, does not smoke or drink alcohol, has normal plasma potassium concentration of 5.4 mEq/L, sodium concentration of 136 mEq/L, plasma calcium concentration is 7.0 mg/dL. Her vitamin D3 value is several times greater than normal, although her 1,25-dihydroxycholecalciferol concentration is at the lower limit of detectability. She has been in renal failure for the last 5 years and undergoes hemodialysis three times each week. What is the cause of her low 1,25-dihydroxycholecalciferol level?