Immune System
Which of the following is correct for isoantigens?

They are antigens found in all members of a species
They are antigens found in all members of different species
They are antigens found in some members of different species
They are antigens found in some members of a species

ANSWER DOWNLOAD EXAMIANS APP

Immune System
Polymorphonuclear leukocytes (or PMNs)

can be attracted to the site of an infection following activation of complement
All of these
are a type of phagocyte that can engulf and kill bacteria
are derived from bone marrow stem cells

ANSWER DOWNLOAD EXAMIANS APP

Immune System
T cell receptors (or TCR) on CD4+ T cells

recognize peptides associated with MHC class I molecules
are secreted out into the environment to bind antigens
recognize peptides associated with MHC class II molecules
recognize peptides not associated with MHC molecules

ANSWER DOWNLOAD EXAMIANS APP