Nitrate reductase is an important enzyme for nitrate assimilation. Given below some regulation of nitrate reductase activity through phosphorylation and dephosphorylation.

a) Light, and other environmental factors stimulate a protein phosphatase that dephosphorylates a key serine residue in the hinge 1 region of nitrate reductase and thereby activates the enzyme

b) In Dark, and Mg2+ stimulate a protein kinase that phosphorylates the same serine residues, which then interact with a 14-3-3 inhibitor protein, and thereby inactivate nitrate reductase

c) In Light, and Mg2+ stimulate a protein kinase that phosphorylates the serine residues, and thereby activate nitrate reductase

d) In Dark, and other environmental factors stimulate a protein phosphatase that dephosphorylates a key serine residue in the hinge 1 region of nitrate reductase and thereby inactivates the enzyme

Which of the following statements about regulation of nitrate reductase is correct?

#Question id: 40478

#Applied Microbiology

Consider the following statements about Macrophages:

1. They are phagocytic cells.

2. They express MHC Class II molecules on their surface.

3. 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).

#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?

#Question id: 40483

#Applied Microbiology

While HFCs (Hydrofluorocarbons) were introduced to replace CFCs because they do not deplete the ozone layer, they are still problematic. Why?