Scientists have recently modified the bacteria that cause tooth decay by inserting a fragment of dna into the bacteria's dna that prevents it from producing lactic acid. what is the new dna called?
foreign dna
restriction dna
recombinant dna
transgenic dna

Recombinant DNA

Explanation:Recombinant DNA is basically a genetically modified DNA that is produced in the laboratory by bringing together different strands of DNA and causing them to bond in order to form a new genome or gene sequence and the whole procedure in performed in Vitro (in laboratory)

The DNA sequence is then inserted into the host to induce specific type of responses.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.