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TLS Online TPP Program

#Question id: 7200

Following statements are regarding to Reaction-diffusion mechanism for proximal-distal limb specification. Which of the following statement is incorrect?

#Unit 5. Developmental Biology
  1. In the inhibitory domain immediately outside the AER, cells are kept dividing by FGFs and Wnts and are prevented from forming cartilage.
  2. In the active domain, each cell secretes but can not respond to activating paracrine factors of the TGF-β family (TGF-β, BMPs, activin) and cell adhesion factors such as galectin-1. These factors stimulate their own synthesis as well as that of the extracellular matrix and cell adhesion proteins that promote aggregation.

  3. The activating cells also stimulate the synthesis of diffusible inhibitors of aggregation (including Noggin and galectin-8), preventing cell adhesion in neighboring regions.

  4. A third domain, the “frozen zone” well beyond the influence of the AER, contains the formed cartilage primordia of the skeleton at proximal regions of the developing limb.
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TLS Online TPP Program

#Question id: 18940

#Unit 13. Methods in Biology

which of the following permits the amplification of chosen segments of DNA or RNA for detailed study or cloning.
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: 27374

#Unit 13. Methods in Biology

An aqueous solution contains two compounds X and Y. This solution gave absorbance values of 1.0 and 0.4 at 220 and 280 nm, respectively, in a 1 cm path length cell. Molar absorption coefficients (ε) of the compounds X and Y are as shown in the table below.

The concentration of Y in the solution is___________ mM.
TLS Online TPP Program

#Question id: 26382

#Unit 3. Fundamental Processes

Due to pseudookazaki fragment eukaryotic replicon is
TLS Online TPP Program

#Question id: 24576

#Unit 10. Ecological Principles

The birth of 100 cockroaches to a population of 1,000 would represent a birth rate. Similarly, the death of 50 cockroaches in a population of 1,000 would be a death rate, d, per individual per week. Calculate the rate of change in a population per unit time ?