DNA Structure and Replication
DNA helicase is used to

interact the double helix closely
break a phosphodiester bond in DNA strand
unwind the double helix
None of these

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DNA Structure and Replication
In DNA, there are

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

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