Genetic engineering involves taking a copy of a gene from one organism and inserting that gene into the DNA of another organism.
Which of the following statements regarding genetic engineering is correct?
A gene of interest is cut from the DNA of one organism using an enzyme called a ligase
B Bacterial plasmid DNA and the organism’s DNA require different restriction enzymes
C Carbon-carbon bonds form between the complementary bases in the sticky ends of the plasmid and the useful gene
D DNA is cut in a staggered way leaving short sections of double-stranded DNA at each end of the gene
E The end nucleotides of the useful gene are joined to the end nucleotides of the plasmid
answer is E , but why is D wrong ?