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 ¹⁴NH₄Cl so that all new DNA will be "light".If replication were dispersive,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 dispersive replication, each strand of DNA is a mix of old and new DNA. After two generations in a "light" medium, each strand would be a mix of "heavy" and "light" DNA, with a higher proportion of "light" DNA due to the new medium.

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

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