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TLS Online TPP Program

#Question id: 7160

How does the dose-dependence of retinoic acid treatment support the notion that a gradient of retinoic acid can act as a morphogen along the proximo-distal axis in the limb?

#Unit 5. Developmental Biology
  1. Treatment with high levels of retinoic acid causes a proximal blastema to be respecified as a distal blastema, and only distal structures are regenerated.
  2. Treatment with high levels of retinoic acid causes any blastema to form only distal structures.
  3. Treatment with high levels of retinoic acid causes any blastema to be respecified as a proximal blastema, but it will form only proximal structures.

  4. Treatment with high levels of retinoic acid causes a distal blastema to be respecified as a proximal blastema, and regeneration of a full limb may be initiated from proximal values.

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TLS Online TPP Program

#Question id: 12658

#Unit 7. System Physiology – Animal

In a person on a high (200 mmol/day) potassium diet, which part of the nephron would be expected to secrete the most potassium?
TLS Online TPP Program

#Question id: 4060

#Unit 3. Fundamental Processes

A polyA tail is added to: 
TLS Online TPP Program

#Question id: 5719

#Unit 8. Inheritance Biology

Homologous chromosomes pair in prophase I as a following way, if crossingover occur between P and Q gene of homologous chromosome?

Which of the following proceeding event due to this abnormality?

A. Dicentric chromosome become breaks at anaphase I

B. Resulting one of the gamete received chromosome with deleted segment 

C. Recombinant gamete unable to produced viable progeny

D. Unable to separation of chromosome in anaphase II
TLS Online TPP Program

#Question id: 7080

#Unit 5. Developmental Biology

In sea urchin, during early development which embryonic cells have similar activity to amphibian organizer?
TLS Online TPP Program

#Question id: 1298

#Unit 4. Cell Communication and Cell Signaling

As fibroblasts form a three-dimensional structure in contact with the ECM, the cells bound to ECM: