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TLS Online TPP Program

#Question id: 7122

Contrast involution, epiboly, and convergent extension.

#Unit 5. Developmental Biology
  1. Involution is the movement of cells toward an axis to extend that axis, epiboly is a flattening and spreading of epithelial cells to increase the amount of surface they cover, and convergent extension is the movement of cells inside the embryo as a coherent sheet.
  2. Involution is the movement of cells inside the embryo as a coherent sheet, epiboly is a flattening and spreading of epithelial cells to increase the amount of surface they cover, and convergent extension is movement of cells toward an axis to extend that axis.
  3. Involution is a flattening of epithelial cells to increase the amount of surface they cover, epiboly is the movement of cells inside the embryo as a coherent sheet, and convergent extension is movement of cells toward an axis to extend that axis.
  4. Involution is the movement of cells inside the embryo as a coherent sheet, epiboly is movement of cells toward an axis to extend that axis, and convergent extension is a flattening and spreading of epithelial cells to increase the amount of surface they cove.
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TLS Online TPP Program

#Question id: 2472

#Unit 2. Cellular Organization

In response to a chemotactic signal, a cell forms structures to aid in locomotion. In lamellipodia, active Rac will stimulate F-actin polymerization at the leading edge via _____, whereas actin that will form stress fibers will be recruited by formin downstream of activation of this small GTPase _____.
TLS Online TPP Program

#Question id: 1794

#Unit 4. Cell Communication and Cell Signaling

Which of the following statements is TRUE of natural antibodies?
TLS Online TPP Program

#Question id: 1300

#Unit 4. Cell Communication and Cell Signaling

Which of these is NOT a component of plant cell walls?
TLS Online TPP Program

#Question id: 12215

#Unit 7. System Physiology – Animal

Damage to the gastric mucosal barrier is a forerunner of gastric ulcer. Which of the following can both damage the gastric mucosal barrier and stimulate gastric acid secretion?
TLS Online TPP Program

#Question id: 15892

#Unit 12. Applied Biology

Which of the following is not an application of tissue culture?