E. coli SSB is a tetramer of 74 kD that binds single-stranded DNA cooperatively. The significance of the cooperative mode of binding.

TLS Online TPP Program

#Id: 1880

#Unit 10. Ecological Principles

The superior competitor hypothesis suggests invasives are more efficient users of natural resources than natives.

TLS Online TPP Program

#Id: 7376

#Unit 5. Developmental Biology

Par-1 protein organizes microtubules specifically with their minus and plus ends at the anterior and posterior ends of the oocyte, respectively

TLS Online TPP Program

#Id: 9297

#Unit 6. System Physiology – Plant

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: 8849

#Unit 2. Cellular Organization

Phosphorylation of MCM helicase activators by G1/S phase CDKs and S phase CDKs, prevents reloading of MCM helicases (ensuring that replication from each origin occurs only once during each cell cycle)

TLS Online TPP Program

#Id: 6608

#Unit 7. System Physiology – Animal

During female reproductive cycle, Estrogen stimulate rapid proliferation of the stromal cells and the epithelial cells of endometrium, before ovulation.