T-lymphocytes mature and differentiate in the thymus. Cytotoxic T-lymphocytes secrete antibodies. Cytotoxic T-lymphocytes in direct contact with an infected cell in order to kill it. Cytotoxic T-lymphocytes secrete , which cause a hole in the target cell's plasma membrane.

T-lymphocytes mature and differentiate in the thymus. Cytotoxic T-lymphocytes _do not_ secrete antibodies. Cytotoxic T-lymphocytes __come__ in direct contact with an infected cell in order to kill it. Cytotoxic T-lymphocytes secrete __perforins_ , which cause a hole in the target cell's plasma membrane

Explanation:

T lymphocytes are the type of immune cells that develop from stem cells in bone marrow and mature and differentiate in thymus.T cells may be either T helper cell (CD8+) or T cytotoxic cells (CD4+).Antibodies are secreted by plasma cells. T cytotoxic cells come in direct contact with infected cell to kill it by secreting the perforins specifically virus infected cells.

Mitochondria is the cell organelle that produced the energy that is needed in the body system in form of atp, that is why it is called the power house of the cell. energy is needed by the living organisms to carry out the activities which sustain life.  if the mitochondria is destroyed atp will not be produced. if the mitochondria is destroyed, energy production will stop and the affected living organism will not have the energy to carry out the necessary life processes; this will lead to the death of the organism.