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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: 33897

#Unit 2. Cellular Organization

Which of the following is correct combination
A. Translocation is an active process in which the DNA is driven into the head by an ATP independent mechanism. 
B. The genome is packaged into the empty capsid by the terminase enzyme.
C. The terminase uses cos sites in linear phage DNA by cleaving at cos sites.
TLS Online TPP Program

#Question id: 11357

#Unit 10. Ecological Principles

In the Lotka-Volterra population models for predator and prey, what is the consequence of an increased birth rate of prey?
TLS Online TPP Program

#Question id: 21114

#Unit 12. Applied Biology

Which one of the following measures changes in mass?
TLS Online TPP Program

#Question id: 22975

#Unit 7. System Physiology – Animal

1,25-dihydroxycholecalciferol stimulates the,
a. Secretion of phosphate ions from kidney
b. Secretion of calcium from kidney
c. Reabsorption of calcium from kidney
d. Reabsorption of phosphate ions from kidney
TLS Online TPP Program

#Question id: 1452

#Unit 4. Cell Communication and Cell Signaling

Which of the following proteins belong to the control system that regulates cells past a certain point in late G1 (START)?