Polyglutamylation and polyglycylation are likely mutually exclusive, so they would not normally occur at the same time & both can enhance microtubule stability,

TLS Online TPP Program

#Id: 10371

#Section 2: General Biology

A given MHC molecule can bind numerous different peptides, and some peptides can bind to several different MHC molecules. Because of this MHC molecule is often referred to as “promiscuous”.

TLS Online TPP Program

#Id: 10382

#Section 2: General Biology

Expression of class II molecules by B cells is down-regulated by IFN-¥.

TLS Online TPP Program

#Id: 9159

#Section 3: Genetics, Cellular and Molecular Biology

TLS Online TPP Program

#Id: 8032

#Section 2: General Biology

Ornithine and citrulline, which are not found in proteins, are intermediates in the biosynthesis of arginine and in the urea cycle.

TLS Online TPP Program

#Id: 8890

#Section 3: Genetics, Cellular and Molecular Biology

Mitotic spindle attach to chromosomes via specialized protein structures known as kinetochores