I am:

double stranded

found in the nucleus

have four nitrogen bases

contain deoxyribose sugar

contain thymine instead of uracil

What important molecule am I?

A)

DNA

B)

RNA

C)

enzyme

D)

protein

I am: A) DNA

DNA is double-stranded molecule which is often also it's most known feature. Perhaps less known (depends on who you ask) are facts that it also has thymine and not uracil (uracil is found in RNA). It has four nitrogen bases and it contains deoxyribose sugar (another hint that it's DNA and not RNA).