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TLS Online TPP Program

#Question id: 29067

Which of the following statements about the birth rates (b1, b2) and death rates (d1, d2) of species 1 and 2 indicated in the figure is true?


#Unit 10. Ecological Principles
  1. Birth rates of species 1 are density independent
  2. Birth rates of species 2 are density dependent
  3. Density dependent effects on birth rates are similar for both the species
  4. Death rates of both species are density dependent
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TLS Online TPP Program

#Question id: 2082

#Unit 2. Cellular Organization

Which of the cellular organelles are enclosed by two cellular membranes?
TLS Online TPP Program

#Question id: 26523

#Unit 3. Fundamental Processes

Some of the human RNA pol II subunit and features are given, match them correctly
TLS Online TPP Program

#Question id: 2910

#Unit 2. Cellular Organization

With respect to the DNA methylation mechanism in mammalian cells, which of the following statements, if any, is true? 

I. The principal role of the DNMT1 DNA methyltransferase is in de novo methylation. 

II. The DNMT3A and DNMT3B DNA methyltransferases require hemi-methylated DNA as a substrate and are responsible for methylating nascent DNA strands that are complementary to methylated parental DNA strands.

III. Active DNA demethylation means removal of methyl groups from a hemi-methylated DNA double helix. 

IV. DNA methylation is not essential in mammalian development.
TLS Online TPP Program

#Question id: 1395

#Unit 4. Cell Communication and Cell Signaling

Which of the following mutations would promote malignancy in cells whose proliferation is inhibited by TGFβ?

a. overexpression of Smad2               

b. loss of Smad 4

c. overexpression of TGFβ receptor I

d. loss of TGFβ receptor II
TLS Online TPP Program

#Question id: 15961

#Unit 12. Applied Biology

In somatic hybridization experiments, only the heterokaryotic or 'hybrid' protoplasts, form only a small proportion of the population. Therefore, an effective strategy has to be employed for their identification and isolation, this step is called;