DNA Structure and Replication
The overall conclusion of the Hershey-Chase experiment was that

DNA was responsible for heredity
phage DNA was similar to bacterial DNA
proteins and DNA were responsible for heredity
the ratio of Adenine to thymine was always the same

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DNA Structure and Replication
Which of the following is used to determine the appropriate stringency (Wallace rule)?

Tm = 2 x (No.of G:C base pair) + 4 x (No.of A:T base pair)
Tm = 69.3° + 0.41 (%)G+C -650/1
Tm = 4 x (No.of G:C base pair) + 2 x (No.of A:T base pair)
Tm = 4 x (No.of A:T base pair) + 2 x (No.of G:C base pair)

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DNA Structure and Replication
In DNA, there are

five bases known as adenine, guanine, thymine, tryptophan and cytosine
four bases known as adenine, guanine, thymine and cytosine
three bases known as adenine, guanine and cytosine
only two bases known as adenine and cytosine

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