TLS Online TPP Program

#Question id: 19692


What does ST interval show on ECG?

#SCPH01 Biochemistry
  1. plateau portion of the ventricular action potential
  2. an isoelectric portion of the ECG that corresponds to AV node conduction
  3. plateau portion of the Atrial action potential
  4. Depolarization initiated in the SA node
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TLS Online TPP Program

#Question id: 10340

#SCPH05 I Biotechnology

There several charecteristics of nitrate reductase, which of the following properties of nitrate reductase is incorrect?

TLS Online TPP Program

#Question id: 10340

#SCPH06 I Botany

There several charecteristics of nitrate reductase, which of the following properties of nitrate reductase is incorrect?

TLS Online TPP Program

#Question id: 10341

#I Life Science/ Life Sciences Group – I-V

The accumulation of nitrate that results from diminished nitrate reductase activity, this symptoms is caused by

TLS Online TPP Program

#Question id: 10341

#SCPH05 I Biotechnology

The accumulation of nitrate that results from diminished nitrate reductase activity, this symptoms is caused by

TLS Online TPP Program

#Question id: 10341

#SCPH06 I Botany

The accumulation of nitrate that results from diminished nitrate reductase activity, this symptoms is caused by

TLS Online TPP Program

#Question id: 10342

#I Life Science/ Life Sciences Group – I-V

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?