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: 40484

#Applied Microbiology

Read the following statements regarding the breakdown of the ozone layer:

Statement I: UV radiation acts upon Chlorofluorocarbons (CFCs) in the stratosphere to release active Chloride radicals.

Statement II: A single Chlorine radical is consumed after destroying one Ozone molecule and cannot participate in further reactions.

Which of the options is correct?

#Question id: 40485

#Applied Microbiology

 Consider the following statements about the "Ozone Hole":

1. It is most prominent over the Antarctica region.

2. It forms primarily during the late winter and early spring.

3. The formation of Polar Stratospheric Clouds (PSCs) facilitates the depletion process.

Which of the statements given above are correct?

#Question id: 40486

#Applied Microbiology

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): The thickness of the ozone layer is measured in Dobson Units (DU).

Reason (R): The ozone layer is found in the Troposphere and protects us from harmful UV-B radiation.

#Question id: 40487

#Applied Microbiology

Match the Chemical/Term (List I) with its description or impact (List II).

#Question id: 40488

#Applied Microbiology

The water activity (aw) of pure water is equal to:

#Question id: 40489

#Applied Microbiology

Which class of microorganisms is specifically adapted to grow in environments with very low water activity (high salt concentration)?