Ascientist uses materials in her lab to turn one piece of dna into 100 copies of the same piece what process is the scientist using use of restriction enzymes polymerase chain reaction gel electrophoresis karyotyping

The correct answer is- Polymerase chain reaction.

Polymerase chain reaction is a technique in molecular biology that is used to produce multiple copies of a piece of DNA molecule through multiple cycles of three stages that are-

1) Denaturation- The two DNA strands are separated  ( so that template DNA are exposed) at higher temperature.

2) Annealing- Primers ( forward and reverse) are attached to the template DNA.

3) Extension- New DNA strand is synthesized using enzyme Taq polymerase that adds dNTPs ( deoxyribonucleoside triphosphate) according to the complementary sequences in the template.        

i think it would be b. tissue because an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

regulation of gene expression. gene expression can be regulated by various cellular processes with the aim to control the amount and nature of the expressed genes. these regulatory proteins bind to dna and send signals that indirectly control the rate of gene expression

explanation: