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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: 15833

#Unit 8. Inheritance Biology

Your friends Ben and Jane are contemplating having children and seek your genetic counsel. Ben and Jane are unrelated, but both have younger brothers with the same, extremely rare genetic trait. (In fact, Ben and Jane met at a support group meeting for children and families of children with this rare disorder.) Ben’s parents and Jane’s parents are all unaffected.          
Assume that the trait is autosomal dominant with 80% penetrance in heterozygotes and 100% penetrance in homozygotes. If not affected, what is the probability that the child is a carrier?
TLS Online TPP Program

#Question id: 5362

#Unit 8. Inheritance Biology

From the following select the possible mode of inheritance and the probability that the daughter in generation III will show the trait.
TLS Online TPP Program

#Question id: 28396

#Unit 5. Developmental Biology

VegT is critical in generating the germ cells, two genes activated by VegT protein that encodes the transcriptional factor as well as paracrine factors that instruct the cell layers to become their fate. which of the following statements is incorrect?
a) Sox17 paracrine factor that specify cells to be endoderm
b) Nodal transcription factors that instruct the cell layers above them to become mesoderm
c) Nodal paracrine factors that instruct the cell layers above them to become mesoderm
d) Sox17 transcription factor that specify cells to be endoderm
TLS Online TPP Program

#Question id: 11137

#Unit 7. System Physiology – Animal

The motor (somatic nervous) system can alter the activities of its targets, the skeletal muscle fibers, because ________.
TLS Online TPP Program

#Question id: 28294

#Unit 5. Developmental Biology

Which enzyme is responsible for harden of the vitelline envelope and convert it into fertilization envelope?