The major NPF family is characterized by the presence of a region called WCA (WH2, connector, acidic)

TLS Online TPP Program

#Id: 9270

#Section 2: General Biology

MoFe protein 

2 pairs of identical subunits (tetramer, nif D & nif K)

A total of MW 180 ~ 235kD

Each subunit has 2 Mo-Fe-S clusters.

Both Fe proteins and MoFe proteins are sensitive to O2. 

TLS Online TPP Program

#Id: 9282

#Section 2: General Biology

Plant genes expressed early, or in the absence of bacterial infection, are termed “early nodulins” or ENOD

TLS Online TPP Program

#Id: 8226

#Section 3: Genetics, Cellular and Molecular Biology

I-cell disease

• almost all of the hydrolytic enzymes are missing from the lysosomes of many cell types.

• mis-sorting has been traced to a defective or missing GlcNAc phosphotransferase.

TLS Online TPP Program

#Id: 8894

#Section 3: Genetics, Cellular and Molecular Biology

Syntelic attachment 

Both kinetochores of a sister chromatid pair can attach to microtubules from the same pole

TLS Online TPP Program

#Id: 2237

#Section 3: Genetics, Cellular and Molecular Biology

Neutral selection (Ka/Ks = 1)

Positive selection (Ka/Ks > 1)

Purifying selection (Ka/Ks < 1)