The solutions in the arms of a U-tube are separated at the bottom of the tube by a selectively permeable membrane. The membrane is permeable to sodium chloride but not to glucose. Side A is filled with a solution of 0.4 M glucose and 0.5 M sodium chloride (NaCl), and side B is filled with a solution containing 0.8 M glucose and 0.4 M sodium chloride. Initially, the volume in both arms is the same.

In the U-tube experiment illustrated above, which of the following statements correctly describes side B at equilibrium?

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#Question id: 7103

#Unit 5. Developmental Biology

Patterning of the Xenopus mesoderm along the dorso-ventral axis involves an antagonistic relationship between chordin and BMP-4. Is there an analogy here to dorso-ventral patterning in the Drosophila embryo?

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#Question id: 7104

#Unit 5. Developmental Biology

The grafting of the dorsal lip of the blastopore from an early Xenopus gastrula onto the ventral side of an early embryo will result in

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#Question id: 7105

#Unit 5. Developmental Biology

The "default model" for neural tissue formation states that

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#Question id: 7106

#Unit 5. Developmental Biology

In what genetic background could beta-catenin turn on target gene expression without Wnt protein?

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#Question id: 7107

#Unit 5. Developmental Biology

What would be the effect on the timing of somite formation, if a piece of the pre-somitic mesoderm of a chick embryo is rotated by 180° and reinserted in its original position?

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#Question id: 7108

#Unit 5. Developmental Biology

Relative to the primitive streak and Henson's node, somite formation in the chick embryo occurs: