Describe the process of scientist use to manjoulate dna?

The process scientists use to manipulate DNA starts by studying and changingDNA molecules. There have been different techniques on how molecular biologists extract DNA from cells, they cut DNA into smaller pieces, then identify the sequence of bases in the DNA molecule and make unlimited copies of the DNA i hope this helps :) 

Ithink that b is correct but just in case wait to see if someone else answers

The basic repeating unit of nucleic acids are known as nucleotides. a nucleotide consists of three distinct chemical groups.