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TLS Online TPP Program

#Question id: 10342

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?

#Unit 6. System Physiology – Plant
  1. A and D         
  2. B and C
  3. C and D             
  4. A and B
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TLS Online TPP Program

#Question id: 2528

#Unit 2. Cellular Organization

Cell walls of prokaryotes, fungi, algae, and plants differ from each other in chemical composition and molecular structure, yet they all serve three common functions:

a) regulating cell volume

b) determining cell shape

c) mechanically protecting the delicate protoplast against biochemical and physical assaults

d) used to make synthetic fibers

Which of the following common functions is correct?
TLS Online TPP Program

#Question id: 1902

#Unit 4. Cell Communication and Cell Signaling

Graft vs host disease occurs on injecting adult T-cells of strain A into:
TLS Online TPP Program

#Question id: 27081

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following is correctly describing the A dihedral angle or torsion angle 
TLS Online TPP Program

#Question id: 1480

#Unit 4. Cell Communication and Cell Signaling

In vertebrate cells, Bax or Bak is required for:
TLS Online TPP Program

#Question id: 18226

#Unit 7. System Physiology – Animal

Effective coping mechanism(s) for handling stress include ______.