E. coli bacteria grew in 15NH4Cl medium for several generations are allowed to grow in 14NH4Cl medium. After 2 generations, the bacteria are isolated from the medium and DNA of bacteria centrifuged in CsCI. The result of the density gradient of DNA is .

Question

E. coli bacteria grew in 15NH4Cl medium for several generations are allowed to grow in 14NH4Cl medium. After 2 generations, the bacteria are isolated from the medium and DNA of bacteria centrifuged in CsCI. The result of the density gradient of DNA is . (A) only hybrid DNA (B) both hybrid and heavy DNA (C) both heavy and light DNA (D) both hybrid and light DNA

Tardigrade Admin · Accepted Answer

Correct answer is (d) both hybrid and light DNA

Q. E. coli bacteria grew in 15NH4Cl medium for several generations are allowed to grow in 14NH4​Cl medium. After 2 generations, the bacteria are isolated from the medium and DNA of bacteria centrifuged in CsCI. The result of the density gradient of DNA is .

only hybrid DNA

both hybrid and heavy DNA

both heavy and light DNA

both hybrid and light DNA

Correct answer is (d) both hybrid and light DNA

Q. E. coli bacteria grew in ¹⁵NH₄Cl medium for several generations are allowed to grow in ¹⁴ $N H_{4} Cl$ medium. After 2 generations, the bacteria are isolated from the medium and DNA of bacteria centrifuged in CsCI. The result of the density gradient of DNA is .