#Question id: 337
#Unit 1. Molecules and their Interaction Relevant to Biology
Which statement below is true about the relative lifetime of a hydrogen bond, compared to the rate of water’s ionization to hydroxide ions and hydronium ions?
#Question id: 10213
#Unit 6. System Physiology – Plant
What is the reason behind that an organism cannot live or die in the presence of both light and molecular oxygen?
#Question id: 31073
#Unit 2. Cellular Organization
#Question id: 11448
#Unit 7. System Physiology – Animal
Artificial electrical stimulation of a human's capsaicin-sensitive neurons would likely produce the sensation of ________.
#Question id: 10342
#Unit 6. System Physiology – Plant
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?