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TLS Online TPP Program

#Question id: 1739

Cross-linking of B-cell surface receptors:

#Unit 4. Cell Communication and Cell Signaling

  1. Is a characteristic feature of thymus-dependent antigens

  2. Lowers the intracellular Ca2+ concentration

  3. Rapidly phosphorylates the Ig-α and Ig-β chains of the surface Ig receptor

  4. Requires contiguity of two B-cell epitopes of different specificity on the same antigen molecule

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TLS Online TPP Program

#Question id: 5128

#Unit 5. Developmental Biology

During lens formation in the Xenopus, the following statements have been proposed. Which statement is incorrect?
TLS Online TPP Program

#Question id: 33315

#Unit 1. Molecules and their Interaction Relevant to Biology
TLS Online TPP Program

#Question id: 31112

#Unit 2. Cellular Organization

Listeria is a food-borne pathogen that causes mild gastrointestinal symptoms. It enters animal cells and divides in the cytoplasm. Listeria has on its surface a protein called ActA, which mimics:
TLS Online TPP Program

#Question id: 19883

#Unit 13. Methods in Biology

Which of the following statements are true regarding rDNA technology?
a) rDNA technology is used to obtain large number of copies of specific DNA fragments
b) rDNA technology is used to obtain large quantities of the protein produced by the concerned gene
c) rDNA technology is used to integrate gene of interest into chromosomes where it express itself
TLS Online TPP Program

#Question id: 8887

#Unit 9. Diversity of Life Forms

Generally, members of which flatworm class(es) are nonparasitic?