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TLS Online TPP Program

#Question id: 7102

How is the Spemann organizer distinguished from the other mesodermal cells during induction by the cells of the vegetal region?

#Unit 5. Developmental Biology
  1. The cells of the Spemann organizer become different as they pass over the dorsal lip of the blastopore during gastrulation.
  2. Beta-catenin, which has become localized to the nucleus in the Nieuwkoop center as a result of cortical rotation, turns on high levels of the TGF- signalling molecule, Nodal, and this relatively high level distinguishes the adjacent cells of the Spemann organizer from the rest of the mesoderm.
  3. The Spemann organizer is formed from cells of the Nieuwkoop center, which have migrated upward in the embryo.
  4. BMP-4 signalling from ventral mesodermal cells toward the dorsal region specify the dorsal-most cells as organizer.
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TLS Online TPP Program

#Question id: 12304

#Unit 7. System Physiology – Animal

Which of the following changes would you expect to find after acute administration of a vasodilator drug that caused a 50% decrease in renal efferent arteriolar resistance and no change in afferent arteriolar resistance or arterial pressure? 
TLS Online TPP Program

#Question id: 10753

#Unit 10. Ecological Principles

Which of the following is correct combination? 
TLS Online TPP Program

#Question id: 3262

#Unit 11. Evolution and Behavior

In a population, the genotype frequencies are: f(A1A1)= 0.35; f(A1A2) = 0.30; f(A2A2) = 0.35; Which of the following statement is correct?
TLS Online TPP Program

#Question id: 24561

#Unit 4. Cell Communication and Cell Signaling

Complement components can be classified into seven functional categories, representing the Proteins Involved in the Complement System in given table;
TLS Online TPP Program

#Question id: 12347

#Unit 10. Ecological Principles

A team of conservation biologists, surveying a population of frogs on an island, captured and marked 312 individuals in the first sample. In a second sampling, 3 days later, the team caught 140 individuals of which 26 were previously marked. The total number of frogs on the island is estimated to be . (Use decimal notation, not fractions or percentage)