A adenine B. guantill Which nucleotides are considered purines? A. adenine and guanine B. adenine and thymine C. cytosine and guanine D. cytosine and thymine 11. 12. If base-pairing rules state that adenine always pairs with and cytosine pairs with guanine, what would be the complement to AGGCT? A. TAGCC B. ATGCG C. TACGA D. TCCGA 13. Which of the following is TRUE to RNA? A. Have purines and pyrimidines; antiparallel strand. B. double stranded; with uracil base. C. single-stranded; with ribose sugar. D. single-stranded; longer than DNA. e 1: Type of Scientific Researcn 14. DNA gives organisms their answer? A. attitude B. cells . Which of the following is the C. parents D. 15. Why is DNA important? A. It is everything B. It provides us energy. C. It was dis​