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: 2089

#Unit 8. Inheritance Biology

C bands detects centromeric heterochromatin in chromosome.

TLS Online TPP Program

#Id: 1319

#Unit 4. Cell Communication and Cell Signaling

The heterotrimeric G protein coupled to rhodopsin, called Transducin.

TLS Online TPP Program

#Id: 7038

#Unit 11. Evolution and Behavior

Darwin’s evolutionary theory - Common descent

TLS Online TPP Program

#Id: 7785

#Unit 2. Cellular Organization

These proteins contain a nuclear-localization signal (NLS) that directs their selective transport into the  nucleus.

TLS Online TPP Program

#Id: 539

#Unit 2. Cellular Organization

Helical bacteria with: 

1. Less than one turn- vibrioid shape

2. Complete turn- helical shape