#Question id: 40477
#Applied Microbiology
Read the following statements regarding immune cells and select the correct option.
Statement I: All nucleated cells in the body can act as professional antigen-presenting cells
Statement II: B cells internalize antigens via receptor-mediated endocytosis and present them to Helper T cells.
#Question id: 40478
#Applied Microbiology
Consider the following statements about Macrophages:
They are phagocytic cells.
They express MHC Class II molecules on their surface.
They are classified as granulocytes like Basophils.
Which of the statements given above are correct?
#Question id: 40479
#Applied Microbiology
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Dendritic cells are critical for initiating a primary immune response.
Reason (R): They are the only antigen-presenting cells capable of stimulating naive T cells.
#Question id: 40480
#Applied Microbiology
Match the Immune Cell (List I) with its primary characteristic/function (List II).
| List I (Cell Type) | List II (Characteristic) |
| A. B cell | 1. Granulocyte involved in allergic responses; releases histamine. |
| B. Dendritic cell | 2. Produces antibodies; acts as an APC. |
| C. Basophil | 3. Phagocyte; acts as a scavenger and APC. |
| D. Macrophage | 4. Most effective APC; bridge between innate and adaptive immunity. |
#Question id: 40481
#Applied Microbiology
Which specific chemical element, released from CFCs in the stratosphere, acts as a catalyst to break down Ozone (O3) into Oxygen (O2)
#Question id: 40482
#Applied Microbiology
Which international treaty was signed specifically to control the emission of Ozone Depleting Substances (ODS) like CFCs?