PCR can be used to selectively duplicate one single gene out of thousands because the only primers available to start replication are the one unique pair that are complementary to the regions on both sides of the gene. Which of these primers (one for each strand) could you use to copy just the stretch (enlarged) of the amelogenin gene that differs between the X and Y chromosomes

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explanation:

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answer: the correct option is d. enzyme

lactase and carbonic anhydrase are the examples of enzymes.

lactase is an enzyme, which is present in the small intestine of mammals. it in the digestion of the disaccharide, lactose ( milk sugar) by converting it into two monosachharide, which are glucose and galactose.

carbonic anhydrase is present in the red blood cells. this enzyme plays significant role in the transport of co₂. it in the conversion of co₂ and h₂o into carbonic acid, which is then dissociated into bicarbonate ions and hydrogen ions.