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?

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#Question id: 80

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 Examine the Fischer projection below. How is this carbohydrate classified

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#Question id: 81

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The Fischer projections of linear D-glucose and D-galactose are shown below. These two molecules are

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#Question id: 82

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The structures of D-ribose and D-arabinose are shown below. These two molecules are

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#Question id: 83

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Which of the following is incorrect about the intramolecular cyclization reaction of glucose in solution ________.

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#Question id: 85

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Below is the structure for a cyclic D-monosaccharide. Which is the anomeric carbon atom?

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#Question id: 86

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Examine the cyclic D-monosaccharide shown below. The ring structure is the ________ and the linear form of this monosaccharide must be a/an ________.