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TLS Online TPP Program

#Question id: 7120

Which of the following is the only true statement regarding compaction in the mouse embryo?

#Unit 5. Developmental Biology
  1. Compaction involves the activation of cadherins, resulting in an increase in cell-cell adhesion among the 8 cells of the embryo.
  2. Compaction involves a polarization of the cells of the embryo, such that ions can be pumped from the outer surface of the embryo into the central cavity, resulting in an influx of water into the central cavity and formation of the blastocoel.
  3. Compaction gives subsequent cell divisions an orientation, such that cell divisions that occur tangential (parallel) to the cell surface will result in one cell being inside the embryo, where it can contribute to the inner cell mass.
  4. All of the above are true of compaction in the mouse embryo.
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TLS Online TPP Program

#Question id: 1345

#Unit 4. Cell Communication and Cell Signaling

Embryos injected with antibodies to fibronectin show inhibited movement of neural crest cells during development of the nervous system. These experiments show that:
TLS Online TPP Program

#Question id: 10339

#Unit 6. System Physiology – Plant

Nitrate assimilates into the root where the conversion of nitrate to nitrite in the cytosol, a reduction reaction that involves the transfer of two electrons catalyzes by an enzyme that is NAD(P)H dependent is known as
TLS Online TPP Program

#Question id: 11679

#Unit 7. System Physiology – Animal

After blood flow is artificially reduced at one kidney, you would expect that kidney to secrete more of the hormone known as ________.
TLS Online TPP Program

#Question id: 3363

#Unit 11. Evolution and Behavior

An autosomal recessive condition affects 1 newborn in 100 in a random mating population without any disruptive acting force. What is the approximate expected frequency of carriers in this population?
TLS Online TPP Program

#Question id: 31215

#Unit 4. Cell Communication and Cell Signaling

ced-9/ced-3 double mutants, resulting: