Bacteria are grown in a medium containing ¹⁵NH₄Cl for a number of generations so that all of the DNA is made of fully "heavy" DNA.The bacteria are moved to a new medium and grown in ¹⁵NH₄Cl so that all new DNA will be "light".If replication were conservative,what would the DNA look like after two generation times. A)All of the DNA is made of 2 "light" strands. B)Half of the DNA is made of 2 "light" strands and half of the DNA is made of 1 "light" strand and 1 "heavy" strand. C)All of the DNA is made of 1 "heavy" strand and 1 "light" strand. D)Each strand is made of a mixture of "heavy" and "light" DNA with each strand being between 75% and 100% "light". E)75% of the DNA is made of 2 "light" strands and 25% of the DNA is made of 2 "heavy" strands.

Question

Quizplus · Accepted Answer

In conservative replication, the original "heavy" DNA remains intact and separate from the newly synthesized "light" DNA. After two generations, 25% of the DNA would still be the original "heavy" DNA, and 75% would be new "light" DNA.

Bacteria Are Grown in a Medium Containing 15NH4Cl for a Number

Bacteria Are Grown in a Medium Containing ¹⁵NH₄Cl for a Number