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TLS Online TPP Program

#Question id: 7279

X chromosome number alone is the primary sex determinant in normal drosophila because:

#Unit 5. Developmental Biology
  1. The X chromosome contains genes encoding transcription factors that activate the critical gene in Drosophila sex determination.
  2. Male and female parts and their sex-linked characters are activated by Y chromosome.
  3. The number of X chromosome is greater than number of Y chromosome.
  4. Only X chromosome is active, Y chromosome is inactive.
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TLS Online TPP Program

#Question id: 18005

#Unit 9. Diversity of Life Forms

Which structure is common to both gymnosperms and angiosperms? 
TLS Online TPP Program

#Question id: 24230

#Unit 4. Cell Communication and Cell Signaling

Classical cadherin molecule do not contains: 
TLS Online TPP Program

#Question id: 27551

#Unit 1. Molecules and their Interaction Relevant to Biology

Glycine at pH 2.34, where there is an equal mixture of +H3N-CH2-COOH and +H3N-CH2-COO-  then the average or net positive charge is 
TLS Online TPP Program

#Question id: 15452

#Unit 4. Cell Communication and Cell Signaling

During  activation of B-cell, T cell delivers cytokines and other signals to its partner B cell. Which types of cytokine signals secreted by T-cells?
TLS Online TPP Program

#Question id: 8852

#Unit 9. Diversity of Life Forms

The upper forelimbs of humans and bats have fairly similar skeletal structures, whereas the corresponding bones in whales have very different shapes and proportions. However, genetic data suggest that all three kinds of organisms diverged from a common ancestor at about the same time. Which of the following is the most likely explanation for these data?