Question 3
Which biochemical molecule, separated from fossils thousands of years old, does genetic engineering use to produce new organisms carrying the characteristics of the old ones?
The right answer is the one marked above.
DNA. It is what carries the information for an organism's characteristics.
Chlorophyll is the pigment plants use to make food; urea is an excretory product; lime water is a reagent for detecting carbon dioxide. None of them carries characteristics.