Which option gives the correct cause-and-effect relationship for Variation and evolution, Genetic engineering: students must describe bacterial cells engineered to produce useful substances such as human insulin.

The correct option is Correct cause and effect: DNA is the molecule; a gene is a functional section of that molecule. This matches Genetic engineering because students must describe bacterial cells engineered to produce useful substances such as human insulin.. It is the only option that keeps DNA vs genes separate and answers the approved learning objective in Genetic engineering.

The correct option is Correct cause and effect: DNA is the molecule; a gene is a functional section of that molecule. This matches Genetic engineering because students must describe bacterial cells engineered to produce useful substances such as human insulin.. Correct cause and effect: DNA is the molecule; a gene is a functional section of that molecule. This matches Genetic engineering because students must describe bacterial cells engineered to produce useful substances such as human insulin. is correct because DNA is the molecule; a gene is a functional section of that molecule. The learning objective says students must describe bacterial cells engineered to produce useful substances such as human insulin, so the answer must stay inside Genetic engineering. The alternative options are wrong because they either treating dna as if it always means one gene., calling a gene a whole chromosome., or drift away from when asking about dna, test molecular structure, base sequence, nucleotides, or genetic information storage..