Question

1. On which cell type is the T-cell receptor located?

• Macrophage

• Cytotoxic T-cell

• Antigen presenting cell

• T-cell

2. What activates a Helper T-cell?

• Recognition of the peptide antigen that is being presented

• Viruses

• Recognition of the peptide antibody that is being presented

• Cytotoxic T cells

Answer 1

T lymphocytes

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