Multiple Choice
Bacteria are grown in a medium containing [15N]H4Cl 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 [14N]H4Cl so that all subsequent new DNA will be 'light.' After one generation time, what does the DNA look like?
A) All of the DNA is made of two 'light' strands.
B) All of the DNA is made of two 'heavy' strands.
C) All of the DNA is made of one 'heavy' strand and one '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) Half of the DNA is made of two 'light' strands and half is made of two 'heavy' strands.
Correct Answer:
Verified
Correct Answer:
Verified
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