Practice Questions

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

The cells of the Spemann organizer become different as they pass over the dorsal lip of the blastopore during gastrulation.
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.
The Spemann organizer is formed from cells of the Nieuwkoop center, which have migrated upward in the embryo.
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: 9282

#Unit 6. System Physiology – Plant

The rate of photosynthesis when red and far-red light are given together is greater than the sum of the rates when they are given apart, the effect provided essential

evidence in favor of the concept that photosynthesis is carried out by two photochemical systems working in tandem but with slightly different wavelength optima

this effect is known as

TLS Online TPP Program

#Question id: 3950

#Unit 3. Fundamental Processes

Which of the following in not true of the nuclear envelope?

TLS Online TPP Program

#Question id: 11671

#Unit 7. System Physiology – Animal

Which process in the nephron is least selective?

TLS Online TPP Program

#Question id: 12434

#Unit 10. Ecological Principles