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TLS Online TPP Program

#Question id: 7186

In dictyostelium stalk and spore cell maturation depends on cAMP level. Which of the following statement is incorrect regarding to this process?

#Unit 5. Developmental Biology
  1. During spore formation, ACG localizes to the spore surface when the prespore vesicles fuse with the plasma membrane. The cAMP phosphodiesterase RegA also plays a crucial role in regulating intracellular cAMP levels.
  2. This process is mediated by socalled sensor histidine kinases/phosphatases which either phosphorylate or dephosphorylate themselves on a histidine residue when a signal molecule binds to their sensor domain.
  3. Ammonia inhibits the onset of fruiting body formation and stalk maturation, activates the histidine phosphatase activity of sensor histidine phophatase C (DhkC), resulting in RegA activation, hydrolysis of cAMP and inhibition of PKA activity.
  4. Spore differentiation factor 2 (SDF-2) activates the histidine phosphatase activity of DhkA (histidine phosphatase A), which results in the inactivation of RegA, the accumulation of cAMP and in PKA activation, which subsequently causes spore maturation.
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TLS Online TPP Program

#Question id: 11246

#Unit 10. Ecological Principles

Which of the following are mechanisms that help prey avoid being eaten by predators?
TLS Online TPP Program

#Question id: 2921

#Unit 2. Cellular Organization

During which stage of the cell cycle is the chromosome content of a mammalian liver cell 1n?
TLS Online TPP Program

#Question id: 11275

#Unit 10. Ecological Principles

Consumption efficiency is the proportion of production at one trophic level that is eaten by, or ingested, by the next trophic level which of the following are correct statement ?

A.Consumption efficiencies higher in  forests than grassland

B-In aquatic ecosystems consuption efficiencies of hervivore are greater than terrestrial hervivore

C- Consumption efficiencies for carnivores are typically higher than those of herbivores

D-Primary production consumption is increased where it is high in nutrients such as nitrogen and phosphorus
TLS Online TPP Program

#Question id: 5068

#Unit 5. Developmental Biology

In TGF-b signaling, the transcription factors downstream from the TGF-β receptors. These transcription factors in Drosophila and the related vertebrate proteins are called:
TLS Online TPP Program

#Question id: 34156

#Unit 7. System Physiology – Animal

Cortisol is bound in the circulation to an α globulin called: