Question

A human body cell is invaded by a new virus that the body has never encountered before. The cell displays the virus's antigens on the cell's membrane. Which of the following best describes what happens next in the body's cell-mediated immune response sequence?
a. B lymphocytes insert into the infected cell and use antibodies to attack and destroy the virus.
b. Helper T cells detect the virus antigens on the infected cell and activate cytotoxic T cells.
c. Memory T cells quickly respond to the virus antigens on the cell by producing cytotoxic T cells.
d. Phagocytes recognize the antigen markings on the infected cell and insert antibodies to destroy the cell.

Answer 1

B, as the helper T cells need to recognise the antigens to know what they need to attack, and they activate cytotoxic T cells to destroy infected body cells.

Answer 2

The best and most correct answer among the choices provided by your question is the second choice or letter B.

Helper T cells detect the virus antigens on the infected cell and activate cytotoxic T cells in the body's cell-mediated immune response sequence.

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