Question

Question 4 1 pt Which of the following is true of B cells (select ALL that apply): born in the bone marrow O can differentiate into plasma cells some types can directly kill a target cell mature in the bone marrow born in the thymus mature in the thymus make antibodies can differentiate into memory cells are considered "antigen-presenting" cells Question 5 1 pts B cell activation requires (select ALL that apply): antiren binding to antibody on B cell surface

Answer 1

Statement 1, 2, 4, 7, 8 and 9 can be applied to define the characteristics of B - cells.

• Lymphocytes are the cells of lymphatic system.
• They are of two types :- B - lymphocytes or B - cells and T - lymphocytes or T - cells.
• Both the lymphocytes are produced in the bone marrow.
• The lymphocytes which mature in bone marrow are called as B-cells/ lymphocytes.
• The lymphocytes which mature in thymus are called as T - cells/ lymphocytes.
• Maturation refers to formation of receptor on the surface of lymphocytes.
• The B-cells differentiate into plasma cells and B-memory cells.
• The plasma cells help to fight a pathogen by producing immunoglobulins, also called as antibodies.
• The B-memory cells keep the information of the infection and produce a quicker and faster response in case of repeated infection by the same pathogen.
• The B-cells also present antigen to the T-cells. Therefore, they are also called as Antigen Presenting Cells (APCs).
• The T-cells differentiate into four types :- T-Killer cells, T- Helper cells, T- suppressor cells and T- memory cells.