Pr chromophore undergoes a cis–trans isomerization between carbons 15 and 16 and rotation of the C14-C15 single bond on red light exposure.

TLS Online TPP Program

#Id: 9931

#XL - T Zoology

Original antigenic sin

Tendency to focus an immune attack on those structures that were present during the original.

This means that our immune systems effectively ignore the subtle changes occurring each year in pathogens

TLS Online TPP Program

#Id: 9932

#XL - T Zoology

TLS Online TPP Program

#Id: 9933

#XL - T Zoology

Bacterial Infections

Bacteria enter the body through several natural routes.

TLS Online TPP Program

#Id: 9934

#XL - T Zoology

Cell wall endotoxins of some gram-negative bacteria activate macrophages, resulting in release of high levels of IL-1 and TNF-α, which can cause septic shock.

TLS Online TPP Program

#Id: 9935

#XL - T Zoology

In staphylococcal food poisoning and toxic shock syndrome, exotoxins produced by the pathogens function as superantigens, which can activate all T cells. 

TLS Online TPP Program

#Id: 9936

#XL - T Zoology

Extracellular Bacteria