Question 1:

Which of the following is considered a primary lymphoid organ?

Explanation: The thymus is considered a primary lymphoid organ. It is where T lymphocytes mature and develop immunocompetence. Therefore, option C is correct.

Question 2:

Which cells are responsible for antibody production in the immune system?

Explanation: B cells are responsible for antibody production in the immune system. When activated, B cells differentiate into plasma cells, which secrete antibodies. Therefore, option A is correct.

Question 3:

Which immune cell is responsible for antigen presentation to other immune cells?

Explanation: Dendritic cells are responsible for antigen presentation to other immune cells. They capture, process, and present antigens to activate T cells and initiate an immune response. Therefore, option D is correct.

Question 4:

Which immune cell is responsible for phagocytosis and killing of pathogens?

Explanation: Macrophages are responsible for phagocytosis and killing of pathogens. They engulf and destroy microbes and cellular debris, contributing to the innate immune response. Therefore, option C is correct.

Question 5:

Which immune response is specific and targeted towards a particular pathogen?

Explanation: The adaptive immune response is specific and targeted towards a particular pathogen. It involves the recognition of specific antigens and the production of antigen-specific immune responses. Therefore, option B is correct.