During recombinant dna technology which structure is used to cut the dna at a specific site?

Why did rutherford say that bombarding atoms with particles was like "playing with marbles" what

Ihave no idea how to solve these. plus there's another question that is 2) a 10 kilogram meteorite is collected in space and brought back to earth. it is composed of 1.25 kg of uranium-238 and 8.75 kg of lead-206. how many u-238 half lives have passed? what is the approximate age of the meteorite?

How are viruses different from eukaryotic cells?