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Immature double negative thymocytes are characterised by which of the following cell surface antigen?

Correct Answer: CD44
Thymocytes comprise of the early T cell progenitor that are present in the thymus and are a part of minor population of lymphoid cells. They lack presence of expression of CD4 and CD8 coreceptor molecules. Major population of thymocytes is immature double negative and are characterised by the expression of CD44 and CD117 cell surface antigens.

The Double Negative thymocytes express the surface markers ___________

Lineage commitment is a process in which CD4–CD8– (double negative) thymocytes differentiate to CD4– and/or CD8– T cells. 

A B cell activates by its first encounter with an antigen called _______ antigen.

Hotel Aditya has 10 single AC rooms, 5 double AC rooms and 18 non AC rooms. The fixed monthly rent of hotel is 150,000. The per day maintenance cost is Rs. 100 for double AC room, Rs. 75 for single AC room and Rs. 40 for non AC room. The per day charges are Rs. 600 for double AC room, Rs. 400 for single AC room and Rs. 250 for non AC room. In April 2003, the occupancy rate of non AC room was 50%, 70% of single AC room and 40% of double AC rooms. Find the profit/loss % for that particular month.

As an immune response to antigen: Salmonella typhimurium, heterogenous populations of memory B cells retain which antibody isotype linked with BCR (B cell receptor) on cell surface?

The depth of centre of pressure (h) for a vertically immersed surface from the liquid surface is given by (where $${I_{\text{G}}}$$ = Moment of inertia of the immersed surface about horizontal axis through its centre of gravity, A = Area of immersed surface and x = Depth of centre of gravity of the immersed surface from the liquid surface)

In asthmatics, mast cell degranulation produced by interaction between antigen and antibody on the cell surface in inhibited by:

Which is the function of cell wall?
1. Provides shape to the cell.
2. Protects the cell from mechanical damage and infection.
3. Helps in cell to cell interaction.
4. Provides barrier to undesirable macromolecules.
5. Imbibes water.

La Nina is suspected to have caused recent floods in Australia. How is La Nina different from El Nino ?
1. La Nina is characterised by un-usually cold ocean temperature in equatorial Indian Ocean whereas El Nino IS characterised by unusually warm ocean temperature in the equatorial Pacific Ocean.
2. El Nino has adverse effect on south-west monsoon of India, but La Nina has no effect on monsoon climate.
Which of the statements given above is/are correct?

Which of the following is not a feature of secondary immune respone to an antigen when compared to the first immune response to the same antigen?