Question

what is meant by an \activated\ t cell?
a a t cell that recognized antigen on a nonspecific leukocyte.
b a t cell that recognized a free floating antigen and bound it.
c a t cell that is patrolling for an antigen from a previous infection.

Explanation:

An activated T - cell is one that has recognized an antigen presented by an antigen - presenting cell (APC). A T - cell does not recognize antigen on a non - specific leukocyte (a is wrong). T - cells don't directly bind free - floating antigens (b is wrong). A T - cell that is patrolling for an antigen from a previous infection is a memory T - cell, not necessarily an activated one. An activated T - cell has recognized antigen presented to it.

Answer:

None of the above options are correct.