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TLS Online TPP Program

#Question id: 7147

How does lateral inhibition work to specify individual neurons in the neural epithelium of invertebrates and vertebrates?

#Unit 5. Developmental Biology
  1. Prospective neurons first arise in a cluster, but then, by chance, one cell will come to signal more strongly through Delta and Notch than its neighbors and become the only neuron in the cluster, by inhibiting its neighbors' specification as neurons.
  2. Stripes of prospective neurons will inhibit formation of neurons in stripes lateral to themselves.
  3. A gradient of inhibition spreads from the cells lateral to the neural epithelium, inhibiting their specification of neurons until a threshold is reached, at which point a single neuron is permitted to develop.
  4. Only one cell in each cluster of prospective neurons is fated to become a neuron, and it does so by inhibiting neural development in its lateral neighbors.
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TLS Online TPP Program

#Question id: 7459

#General Aptitude

The angle between the minute hand and the hour hand of a clock when the time is 8 : 30 , is
TLS Online TPP Program

#Question id: 2666

#Unit 2. Cellular Organization

A cell does not want to waste energy synthesizing the amino acid arginine if arginine is present in its diet. Therefore, when arginine is present, it activates a repressor protein to prevent transcription of genes that code for enzyme to make arginine. This is an example of what type of regulation?
TLS Online TPP Program

#Question id: 26980

#Unit 10. Ecological Principles

Which of the following statements about the selection pressure is incorrect?

a.If survival of juveniles and adult is poor then selection favours a single act of reproduction

b.If survival of juveniles and adult is poor and unpredictable then selection favours repeated reproduction and long reproductive life

c.If the environment is stable then selection favours a single act of reproduction.

d.If survival of juveniles is very poor and unpredictable but adult are more likely to survive then selection favours repeated reproduction and long reproductive life

e.If survival of adult is unpredictable but juveniles are more likely to survive then selection favours a single act of reproduction
TLS Online TPP Program

#Question id: 15561

#Unit 12. Applied Biology

Which mechanism is helpful in secondary metabolite production
1. ppGpp secretion
2. Autoinducer
3. Nutrient limitation
4. Senescence genes
Which combination is incorrect  from the following.
TLS Online TPP Program

#Question id: 1558

#Unit 4. Cell Communication and Cell Signaling

Work of follicular dendritic cells