Nitrogen (N) normally forms three covalent bonds with a valence of five. However, ammonium has four covalent bonds, each to a different hydrogen (H) atom (H has a valence of one). What do you predict to be the charge on ammonium?

TLS Online TPP Program

#Question id: 1600

#Unit 4. Cell Communication and Cell Signaling

What is the name of MHC in humans?

TLS Online TPP Program

#Question id: 1601

#Unit 4. Cell Communication and Cell Signaling

Cytotoxin T cells express

TLS Online TPP Program

#Question id: 1602

#Unit 4. Cell Communication and Cell Signaling

Following are some of the characteristics of MHC 1 and MHC 2 both , except 

TLS Online TPP Program

#Question id: 1603

#Unit 4. Cell Communication and Cell Signaling

MHC is,

TLS Online TPP Program

#Question id: 1604

#Unit 4. Cell Communication and Cell Signaling

Many viruses produce a protein immunoevasin that interferes with antigen presentation by MHC class I molecules. The immunoevasin interfere MHC presentation by

TLS Online TPP Program

#Question id: 1605

#Unit 4. Cell Communication and Cell Signaling

inhibition of class I presentation,