Alymphocyte that, when activated by a t cell, becomes a plasma cell and produces antibodies

Answer is B lymphocyte.

B lymphocyte becomes a plasma cell and also produces antibodies when activated by a T cell. Different B cell lymphocytes produce one unique antibody against one unique epitope, (An epitope is the specific binding site/target on which an individual antibody binds).

ans.

dna fingerprinting is defined as a process that determines the dna characteristics of an individual. these dna characteristics are unique among individuals as their fingerprints, so it is known as dna fingerprinting.

steps of dna fingerprinting includes extraction of dna from sample, amplification of dna, restriction digestion of amplified dna, and then analysis of dna by gel electrophoresis, respectively.

thus, the next step performed by the scientist is 'to cut the amplified dna (obtained by polymerase chain reaction) by restriction enzymes that cleave the dna into fragments and their analysis.'