1. On which cell type is the T-cell receptor located?
Antigen presenting cell
2. What activates a Helper T-cell?
Recognition of the peptide antigen that is being presented
Recognition of the peptide antibody that is being presented
Cytotoxic T cells
The T-cell receptor (TCR) is a protein complex found on the surface of T cells, or T lymphocytes, that is responsible for recognizing fragments of antigen as peptides bound to major histocompatibility complex (MHC) molecules. Option d is the answer
Question no 2
Helper T cells do not directly kill infected cells, as cytotoxic T cells do. Instead they help activate cytotoxic T cells and macrophages to attack infected cells, or they stimulate B cells to secrete antibodies. Helper T cells become activated by interacting with antigen-presenting cells
So option a is the answer
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