Platelet-activating factor released from basophils and stimulates platelet aggregation and the release of vasoconstrictor serotonin from platelets.

TLS Online TPP Program

#Id: 8095

#XL - T Zoology

Platelet-activating factor released from basophils and stimulates platelet aggregation and the release of vasoconstrictor serotonin from platelets.

TLS Online TPP Program

#Id: 9294

#XL - S Microbiology

Nitrate reductase

Homodimers, two identical subunits

Each subunit with 100kD

Each subunit contains 3 prosthetic groups:

FAD, heme, and molybdenum complexed to pterin (an organic molecule). 

TLS Online TPP Program

#Id: 9295

#XL - S Microbiology

The nitrate reductase dimer- Three binding domains

TLS Online TPP Program

#Id: 9296

#XL - S Microbiology

TLS Online TPP Program

#Id: 9297

#XL - S Microbiology

Nitrite reductase

Nitrite (NO2-) is a highly reactive, potentially toxic ion.

Plant cells immediately transport the nitrite into chloroplasts or plastids.

The enzyme nitrite reductase reduces nitrite to ammonium.

Leaf chloroplasts and root plastids contain different forms of nitrite reductase.

Each polypeptide contains two prosthetic groups, an iron-sulfur group and a specialized heme.

NO3-, high sucrose conc, and light induce the transcription of nitrite reductase mRNA.

Asparagine and glutamine repress the induction.

TLS Online TPP Program

#Id: 9298

#XL - S Microbiology

A.  Chloroplasts

TLS Online TPP Program

#Id: 9872

#XL - T Zoology

Innate immunity is the most ancient form of defense, found in all multicellular plants and animals.